90' Abeking & Rasmussen 1956



To Learn More Contact

Ron Housman



Full Name *
Email *
Phone Number *



90' Abeking & Rasmussen 1956 SEA DIAMOND



Starting forward is the crew quarters with upper and lower berth. This cabin has opening portholes with safety covers. Built in to the locker forward is a Miele washing machine and dryer. To port is a head with toilet, washbasin, and shower. Port aft is a captain’s cabin with double sized berth and opening portholes.

The galley is aft to starboard. There is a small passageway forward. In this passageway is a stainless steel and teak ladder up to the crew scuttle. In the passageway is seen an ICOM model #M405 VHF radio and a fire blanket.

The main salon and dining area are on the lower level. There are three deck hatches, portholes across the front, and portholes in the cabin sides. There is a large circular settee to port with dining table and two loose chairs. To starboard is a smaller settee with tables. Starboard aft is a day head. Alongside is a marble top with sink. Aft are stairs to the upper salon. Centerline aft is a sound door which reveals a watertight door to the engine room.

The upper salon is up approximately 5 steps and has large fixed windows and portholes. To port is a built­in settee with table. To starboard is a small settee. Port aft is a desk. Built into the desk is a Panasonic TV on a list. There are soft patches in the deck and overhead for engine removal. 



Forward are the stairs down to the main salon. Aft are stairs up to the wheelhouse and stairs down to the guest accommodations.

In the aft lower passageway is a cabinet. In here are the centerboard winch controls and winch. The winch is fitted with a 7 x 19 stainless steel cable. Aft of this cabinet and down lower is a removable locking pin for the centerboard.

To starboard off the passageway is a guest stateroom with double size berth and opening portholes. There is a door aft of the head with a second door to the passageway. The head has a toilet, washbasin, and enclosed shower.

To port is a guest stateroom with two lower berths and a porthole. Low in the locker is the Koopnautic main control panel. This stateroom shares the head across the passageway.

The master stateroom is aft. It is full beam with opening portholes. There is a centerline queen, two settees and deck hatches. In here is seen a multifunction phone. There is a private head with toilet, washbasin, and enclosed shower.

The interior of the yacht has had a complete and major refit. It has been redesigned with all new solid teak woodwork. The interior design is all raised paneling and high gloss varnish. The cabin soles throughout are teak and holly. The interior of the yacht is in new condition. (See remarks.) 


  • (2) Stainless steel sinks ­ (1) with disposal
  • Frigobar (2) door stainless steel refrigerator
  • Frigobar (1) door stainless steel freezer
  • Miele dishwasher
  • Gimbaled stainless steel stove
  • Trident remote gas shutoff solenoid
  • Multifunction phone
  • GE Profile microwave oven with ventilation and light
  • (3) Sentry tank gauges with alarms for water tanks 

Navigation and Electronics

SEA DIAMOND is a single station vessel with all of her main electronics, navigation, monitoring, and communication equipment located in the wheelhouse.

  • Koopnautic stabilizer panel with fin angle indicators
  • Sperry magnetic compass
  • Danforth magnetic compass
  • Set of analog engine gauges
  • Brooks & Gatehouse wind direction
  • Matched set clock and barometer
  • Kahlenberg model #M­511A automatic whistle control
  • Exalto wiper control
  • ACR model #RCL100 remote spotlight control
  • Simrad model #AP26 automatic pilot
  • (2) LCD monitors for radar and plotter
  • Furuno radar
  • Furuno GPS/WAAS navigator
  • (2) B & G Hydra II multifunction instruments
  • ICOM model #IC­M602 VHF radio with distress call
  • Furuno satellite compass
  • Bow thruster control 
  • (2) Emergency engine stops

Engine Room and Mechanical

The engine room is accessed via a quick acting dogged and gasketed hinged door with round viewing port. Secondary access is via the emergency escape into the starboard side of the upper salon. A removable ladder is provided at the forward bulkhead engine room access. The forward engine room access door is on centerline aft through a lockable varnished wood finished door from the lower salon.

The engine room is well lit with AC fluorescent and DC overhead spotlighting. This space is insulated behind painted perforated sheathing. The deck plates are single knocked aluminum panels with a painted finish secured with stainless steel machine screws on painted steel frames. The engine room is fit with four deadlights with covers. Engine room ventilation is provided via inline axial flow AC electric ducted supply and discharge blowers located port and starboard. Port ventilation is exhaust; starboard is intake. Engine room fire suppression is via an automatic/manual Fireboy extinguisher FM200. A CO2 portable fire extinguisher is mounted forward. Aft is mounted a 1.5 gallon AFFF portable fire extinguisher. Bilge pumping is by three submersible DC electric bilge pumps, main engine belt driven Jabsco impeller pump with manual clutch, and by the central bilge pumping system pickup with AC electric pump. The bilges are monitored via pump mounted 2­stage float switches. There is a mechanic’s toolbox with various hand tools and a 6” cast iron vise. To port, mounted about the watermaker, is a StarBoard work surface. 

  • (2) GM Detroit Diesel 6V71 naturally aspirated two­-stroke freshwater cooled diesel main engines
  • (2) Allison marine reversing gears
  • (2) Northern Lights 32­kW diesel electric generators
  • Village Marine Tech model #PW 1200, serial #104A4 220­volt AC single phase, 60­hz, 1,200­gallon per day reverse osmosis desalinization plant with test date stamp 11/13/01. The unit is fitted with a StarBoard composite work surface above. It has a freshwater flush system and 5 and 20 micron raw water feed pre­-filters.
  • Torrid model #MV30 30­gallon, 1,500­watt, 230­volt AC, 6.26 amps, single phase house potable water heater
  • Marine Air raw water cooled chillwater air conditioning system consisting of (2) 48,000 BTU compressors each model #MCW 48­SRCN and #MCW48­ SRCDDC. This system consists of chillwater, raw pump relays and reverse cycle heat. The raw water cooling pump is a Century AO Smith 1⁄2­hp 230/115­ volt AC electric pump.
  • Paragon/Groco model #PSR 24­volt potable water system pump
  • Headhunter Xcaliber model #XRS­14 230­volt DC 10­ gallon per minute, 68 Psi rated potable water system pump
  • Potable water system suction and discharge isolation valves
  • (2) Koopnautic hydraulic stabilizer fin heads with Breuninghaus Hydromatik direct PTO driven hydraulic pump off the front of the port main engine with split hydraulic reservoir with sight glass and gauge and a Sendur raw water cooled heat exchanger and Naiad canistered type filter with service indicator
  • Duplex Groco bronze raw water strainers for the main engines and generators
  • Capac model #NO50030 corrosion monitor system
  • Port generator Oilgear PTO pump with electric clutch and raw water heat exchanger and split reservoir with sight glass for the bow thruster
  • (2) Exide group 31 625­cca 12­volt DC generator start batteries (one each generator) each with disconnect switch located inside an acid proof ventilated box
  • Single split hydraulic reservoir servicing both the bow thruster and stabilizer systems
  • Tank Sentry tank level system monitoring for forward and aft black and gray water tanks
  • Fuel transfer manifold with properly labeled 24­volt DC Walbro and 115­volt AC ITT Jabsco fuel transfer pumps and Racor model #500 fuel filter water separator on the suction side of the transfer system
  • AC and DC fuel priming and transfer pump selector valve with priming line isolation valve
  • Marine Air DDC digital display control panel for the air conditioning system
  • Headhunter Tank sentry level system monitors for the port and starboard forward and aft fuel tanks 
  • Forward engine room/port salon central bilge suction selector valve
  • Haight model #3E­S23A 1/3­hp AC electric oil change pump
  • Split bus main electrical panel split into load groups 1 and 2, each group with analog meters and selector switches for volts, amps, hertz for shore power generator inverter power supply systems, indicator lamps for power available, and two Xantrex inverter display control boards.
  • Leeson Oberdorfer AC electric black water macerator discharge pump
  • (2) Main engine start 12­volt DC battery banks, each consisting of (2) Lifeline sealed lead acid 12­volt DC batteries. The port bank is located aft inboard of the port main engine. The starboard bank is located forward of the starboard main engine.
  • Charles Marine Products 12­volt DC battery banks charger – 40­amp 5000 Series
  • (2) McCarron VMI 75­amp, 24 volt DC house #1 and #2 battery bank chargers
  • House battery bank system selector disconnect switch and main DC load magnetic circuit breaker panel 
  • House battery banks #1 and #2, each 24­volt DC bank consisting of (2) 12­volt DC banks. Each 12­volt DC bank is comprised of (6) 2­volt DC deep cycle golf cart type batteries. The batteries are secured in custom fabricated plastic boxes with StarBoard lids.
  • House battery banks new January 2012 including self­ filling system, 1680 Ah
  • Main engine fuel supply and return manifolds servicing all four storage tanks
  • (2) Xantrex ProSine Sine Wave inverter chargers with DC supply by the house battery banks #1 and #2 selectable by manual switch
  • Pro Lone model #33­50 battery isolator rated at 250 amps
  • Sealand engine room black water tank vent filter Ship’s service air chuck
  • (2) Kahlenberg model #CE­50 Type 2 3603 single stage belt driven ship’s service and toilet air compressors, one 24­volt and one AC 1⁄2­hp with Century belt driven electric motor
  • Baldor 230­volt emergency bilge pump with auxiliary sea chest suction priming line, labeled bilge suction manifolds, and suction crossover to the starboard main engine driven crash pump
  • Marine Air model #PMA1000 230­volt AC refrigeration raw water cooling pump
  • (2) Grunert raw water cooled refrigeration compressors model #AC4100Z
  • Overhead emergency escape hatch
  • Soft patch panels to the upper salon
  • (3) Pressure switch safety interlocks triggered by the fire system for the main engine, generator, and ventilation vent shutoffs
  • Sailing gear 24­volt DC electro hydraulic power pack with (2) independent 24­volt DC electric motors
  • (2) Victron energy Centour battery chargers 24v ­100amps 

The engine room is well kept and well maintained. It is apparent that the engine room has been recently refit. 

Main Engines

SEA DIAMOND is powered by a pair of GM Detroit Diesel 6V71N naturally aspirated freshwater cooled 2­stroke diesel main engines built on remanufactured long blocks. The main engines are rated for a reported 210­hp at 2100 RPM.

The main engines are close coupled to Allison Marine reversing gears. There are no data plates on the reversing gears; however, documentation onboard indicates the final drive ratio of 2.05:1.

The main engines are single isolation mounted on the main longitudinal in the engine room. There are Kobelt hydraulic disc shaft brakes actuated by reversing gear clutch pressure. The output shafts pass through the aft bulkhead of the engine room and are sealed by a packing gland. Shafts run in pillow block type greased bearings and exit via steel stern tubes with Tides Marine type Strong dripless seals.

Each main engine is fit with a Parker Racor main engine crankcase recovery system. The main engines are 24­volt DC start off dedicated battery banks. The battery banks are maintained by engine belt driven alternators or by dedicated 12volt DC battery charger located in the engine room. The port main engine PTO drives the stabilizer hydraulic pump. The starboard main engine belt drives a Lestek 24­volt DC 240 amp alternator for the house battery bank system. Each main engine and reversing gear is plumbed with an oil change system quick connect. The main engine exhausts are dry stainless steel risers with hard coat insulation to water lift stainless steel mufflers with discharge out the transom. The exhaust connections are black exhaust rubber hose and fiberglass extension pipes with stainless steel hose clamps. The starboard main engine belt drives a manually clutched Jabsco impeller type emergency bilge pump with cross connect to the main bilge system. The main engine controls are Morse single lever with chain and cable arrangement. The main engines are each protected by a single Racor model #1000 fuel filter water separator with pressure/vacuum gauges. The main engines have local start/stop panels located in the engine room with bridge start disable and Murphy switch gauge package with alarms for main engine oil pressure, jacket water temperature, gearbox oil pressure, amps, tachometer, hours and raw water pump suction vacuum. 


SEA DIAMOND is fit with a pair of Northern Lights naturally aspirated diesel electric generators single isolation mounted inside full factory sound shields. Each generator is 12­volt DC start off dedicated 12­volt DC batteries located adjacent to each generator. The generators belt drive 12­volt DC alternators. The exhaust is dry hard coat insulated to stainless steel water lift type mufflers with discharge out the transom. Generator exhaust connections are hose with fiberglass pipe extensions and inline fiberglass mufflers. Each generator is plumbed with an oil change system quick connect fitting. The generator fuel systems are serviced by Racor 500 fuel filter water separators. The port generator PTO drives the bow thruster system hydraulic pump with electric clutch selectable at the helm. Each generator is fitted with a Northern Lights model #S­3C gauge panel with local start/stop preheat and analog gauge package for jacket water temperature, oil pressure, volts, and hours. The generators are rated for 32­kW, 32­kva, 60­hz, 1800 RPM, single phase, 240/120­volt AC, 133/267­amps. 

Deck Profile and Equipment

SEA DIAMOND has full teak decks with low open bulwarks, on top of which are well fitted heavy teak caps. On top of the caps are single vinyl covered stainless steel lifelines on stainless steel stanchions. There are gates port and starboard.

Her teak decks are well fitted. The teak decks are built with waterways. The decks are blind fastened. The decks are in excellent condition.

In the stem is a Sampson post. Centerline on the deck forward is a horizontal Ideal electric windlass with two gypsies and a capstan. There is a 5/8 chain on each gypsy of undetermined length. The chains are fitted with chain stoppers and devil’s claws. Forward of the windlass is a double hatch into the chain locker. On deck to starboard is an aluminum deck box. Inside is a stainless steel propane locker with two bottles and remote shutoff. Mounted on deck to port is a whisker pole.

On the forward housetop around the mast step is a pin rail with stainless steel pins. On the forward housetop are three opening deck hatches. Forward of the mast is an Andersen model #68ST two­speed self tailing hydraulic windlass with two footswitches.

On top of the pilothouse is a Givens 8­person life raft and a stainless steel boom cradle. On the sides of the house are two decorative throw rings and two dorades. On the starboard side of the house is a hand­operated spotlight.

In the deck amidships are Highfield levers for the running backs. To starboard aft is a small davit for the dinghy stage. In the center of the aft deck is a warping windlass.

On the after housetop are two Andersen stainless steel model #7857 two­speed hydraulic winches with footswitches and a single Barient model #36 self tailing winch. On the aft housetop are two opening deck hatches. Also mounted here is a Switlik 6­person canistered life raft with hydrostatic release.

The wheelhouse is on top of the coach roof several steps up from the main deck. The wheelhouse is of open construction. It has a glass windshield with Plexiglas and vinyl enclosure aft with half doors port and starboard. Each of the doors has a guardrail. The overhead has a large Plexiglas panel. Aft is a built­in circular lounge with table. To helm is a stainless steel destroyer type wheel with teak spokes on a freestanding pedestal. The controls are single lever cable. There is safety gear stowed beneath the lounge seats. Built­in to starboard is a small refrigerator. Just above is a signal flag locker. In the cabinet port side forward is a DC circuit breaker panel fitted with voltmeters, amp meters, and rotary selector switch. Built­in the lounge aft are two ventilation blowers for the guest and master heads. 


Access to the lazarette is via a hatch in the after housetop. The lazarette is well painted and lit. There are floorboards in the lazarette. It is used for storage. Beneath the floorboards is the steering system. It is a heavy quadrant on a heavy rudderpost with stainless steel 7 x 19 cable through welded box sheaves. Beneath the quadrant is an electro hydraulic steering pump with a single ram to the quadrant. This ram is activated through the automatic pilot. Also seen here is an emergency tiller. In addition to the general storage items seen in the lazarette is one of the original CQR anchors with chain leader. Extending down from the overhead is the aft deck warping windlass motor. 


SEA DIAMOND is of all steel construction. She is a full displacement, canoe stern sailing yacht design. She has a centerboard offset to the port side of the keelson. She has dual propellers and a single rudder with a canoe stern. In the bow is a bolted stainless steel striker plate. She has full length rub rails with stainless steel half oval chafe guards. Her main engine exhaust is out the horn. She is painted in all white with green boot stripe. Her topsides are in good condition, painted and faired to high standards. 

Her bow thruster is 12” in diameter with no eyebrow or relief. There are bolted horizontal grates. She has dual counter rotating 5­bladed bronze propellers on a bronze foot. The bow thruster is in good apparent condition.

Her stabilizers are welded steel construction. They are on palms or flanges. They measure approximately 38” x 56”, or approximately 15 square feet each. Her stabilizers are found to be in good condition, showing no signs of damage.

She is twin diesel engine powered. Her shafts are 21⁄4” stainless steel one­piece in bolted steel vee main struts with a bearing in each strut. Her propellers are three­bladed bronze stamped 29.5 x 20. They are installed with cone nuts. The propellers cannot be turned by hand at this time, however, it is noted she has been hauled out for an extended period of time. Her dripless bearings are obviously dry.

She has a single fabricated steel rudder measuring approximately 44” x 59”. The rudder is on an extended skeg. The rudder upper and lower bearings all appear to be in good condition. 

Sails and Rigging

SEA DIAMOND has an all wood ketch rig. Her mainmast and mizzenmast were replaced with new in 2009. She is a 7/8 rig with single spreaders with jumper stays on the main and mizzen with a triatic between the mastheads. She has two lowers, a single upper, staysail, standing backs, and running backs.

  • Sails: Sperry 2003, New Genoa, 2010
  • Roller furling: Reckmann
  • Winches: Andersen primary ­elec.
  • Aft and foredeck hydraulic 78ST hydraulic P&S
  • Assorted manual
  • Whisper pole: Bright varnished 

Chain Locker

Entry into the chain locker is via a pair of heavy teak flush hatches in the foredeck. These hatches are fitted with dogs. The gutters are stainless steel. The center part of the gutter removes for access into the compartment. This area is lit and painted. The chain bin is divided with spurling pipes through the after bulkhead. Forward are the hawse pipes fitted with chain wash. Extending down from the deck forward is a Samson post. Forward down the port side is the stainless steel hydraulic plumbing for the headstay roller. The anchor bins are lined with a hard plastic material. 

Recent Upgrades

  • Watermaker: Full service and new membranes January 2012
  • Battery bank: New January 2012 including automatic filling system 1680 Ah.
  • Airco system: Full serviced December 2011
  • Deck winches: Completely disassembled and fully serviced 


Built by Abeking & Rasmussen and designed by Philip Rhodes you couldn’t ask for a better pedigree. SEA DIAMOND is very well known in yachting circles around the world. She is an exceptional vessel that has been well maintained by her very generous owners over the years. Between 2001 and 2004 SEA DIAMOND underwent a major interior and major systems refit at the cost of 6 million dollars. Her entire interior was completely stripped down to bare hull and a new interior was built from scratch. The work was performed at Fairhaven Shipyard, Fairhaven, MA over a 3 year period. A team of craftsman with nothing but the best wood working skills was assembled for the new interior joinery work. The end result was a beautiful masterpiece of wood work. At the same time, the entire teak deck and sub­decking were replaced. Also during this refit period, complete new AC and DC electrical systems were installed, including all new pumps, air conditioning, and galley appliances. Two new 32 kw Northern Lights generators were installed just before this refit.

In 2009 all new Sitka Spruce masts and booms were built, along with all new custom fabricated metal mast hardware. In 2010 the entire interior was redecorated with all new fabrics and soft goods. The end result was stunning for a yacht of her age, better than the day she was built!

SEA DIAMOND is matchless. And although she has been reworked from a mere shell, her period piece quality has been retained. At the same time, she offers a full array of modern amenities and serves as the perfect hostess to the most discerning guest.

SEA DIAMOND always attracts a great deal of attention in harbors and anchorages everywhere. 

LLC Wording

This yacht is owned by a Limited Liability Corporation (LLC) and any interested party should consult a Maritime Attorney to discuss potential tax saving benefits. 


Potential purchasers should assume that items on the vessel at the time of viewing, but not specifically listed on this sheet, are not included with the sale of the yacht. These specifications are believed to be true and correct but cannot be guaranteed. 



Abeking & Rasmussen


Cruising Ketch

Cruise Speed:


Max Speed:

10 KTS

Range NMI:



22' "

Engine Details:

Detroit Diesel 6V71

Engine 1:

210.00 HP

Engine 2:

210.00 HP

Engine Fuel:


Fuel Capacity:

3000 GAL

Water Capacity:

1800 GAL


This listing is presented to you courtesy of a member of the International Yacht Brokers Association and may be centrally listed with another broker. It is offered as a convenience by this broker/dealer to its clients and is not intended to convey direct representation of a particular vessel.

The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

Other Yachts for Sale


82' Latini Marine 2005

Call Italy


81' Nautor Swan 1993

Naples Italy


82' Sunseeker 2005

Fort Lauderdale, Florida