Mason 33 Sailboats for Sale

The hull is a moderately heavy full-keel design with a cut-away forefoot — more wetted surface than a modern fin-keeler, but also a deeply comfortable motion offshore. The iron ballast keel is embedded inside the hull molding rather than bolted externally, which suits the design but is worth understanding before you survey. Displacement is substantial for thirty-three feet, and that displacement buys you genuine bluewater storage capacity and a seakindly motion that lighter boats of comparable length simply cannot replicate. The comfort ratio reflects a boat that earns its keep on passages, not boat-show comparisons.

Layouts on the Used Market

The Mason 33 offers a single interior layout, so there is no variation to navigate. The forward cabin holds a port-side double berth suited to a couple at anchor or in moderate conditions; during heavy-air passagemaking, the settees become the sleeping stations. Port and starboard settees flank a centerline table, with a pilot berth available on the port side — most owners convert that space to storage rather than use it as a berth. The galley is to starboard at the companionway, the nav station opposite to port, and the head is forward of the main saloon with a shower that drains to a sump tank. The forepeak is unusually generous for a boat this size and survives in most examples largely as designed, which is a meaningful advantage for cruising couples who actually need stowage. The layout is honest and consistent across the production run; what you see in one example is essentially what you will find in another.

Equipment and Common Upgrades

On the used market, Mason 33s commonly arrive with radar and a spinnaker already aboard, reflecting their cruising pedigree and the caliber of owner who has typically looked after them. Teak decks are widely seen — Ta Shing fitted them as a factory option and many owners chose them — which enhances the appearance and footing but demands ongoing maintenance attention. AIS transponders and autopilots are frequently fitted, as are hot-water systems; boats that have spent time as liveaboards or crossed oceans invariably carry these. Air conditioning appears on a meaningful share of examples, particularly those that have spent time in warmer climates.

Among owner upgrades, chartplotters and VHF/AIS integration are a frequent addition as electronics age out and get replaced. Lithium battery banks and associated inverters are a newer upgrade seen on more recent refits, often paired with additional solar panels or a wind generator. Asymmetric spinnakers turn up on boats whose owners have done downwind passages and wanted a more manageable downwind sail than the symmetric that often came with the boat. Electric winches are an occasional refit choice, though the cockpit winch placement makes this less straightforward than on more modern designs.

The original Westerbeke or Yanmar diesel is almost always the powerplant found aboard, sometimes rebuilt and sometimes replaced. Given the age of the fleet, engine hours and service history are worth examining carefully. The original three-blade propeller is common; some owners have experimented with two-blade folding or feathering propellers to reduce drag on passage, though the hull design creates a characteristic vibration with two-blade fixed props under power.

What to Inspect

The construction is generally honest and well-executed, but the age of the fleet demands diligence on a survey. The hull laminate is solid fiberglass without coring in the topsides, which is durable, though blistering is a known possibility and an epoxy barrier coat was recommended even at the factory. Inspect the topsides and bottom carefully for osmotic blistering, and ask whether an epoxy barrier coat is present.

The iron keel is the most unusual aspect of the construction. The ballast iron is placed inside the hull molding in two pieces, taped and sealed against rust; a hard grounding or years of accumulated moisture can compromise that seal. Have the surveyor probe the bilge carefully around the keel floors and look for any rust staining, soft spots in the bonding, or evidence of weeping. This is not a common failure, but it is specific to the design and worth specific attention.

The hull-to-deck joint uses an inward-turning flange fastened with through-bolts and covered by the teak toerail; earlier Mason models had a reputation for occasional leaks at this joint. The 33's joint is designed more robustly, but any boat this age is a candidate for fresh bedding compound. Check the underside of the toerail and the joint interior for staining or soft core material in the deck.

Teak decks, where present, should be inspected for fastener leaks into the underlying balsa-cored deck. Older teak overlay that has thinned through years of scrubbing is a maintenance liability; the underlying deck core can absorb water through aging caulk seams or compromised fasteners, and core moisture is expensive to remediate. A moisture meter reading across the deck areas is worth the surveyor's time.

Engine access requires removing the companionway steps and a drawer assembly. This is a mild inconvenience for maintenance but does mean that oil changes and routine service are less casual than on boats with simpler engine access. Ask for full service records and satisfy yourself that the engine has been maintained consistently despite the access awkwardness. Fuel capacity is thirty-five gallons, adequate for offshore use, but fuel tank condition on a boat this age merits inspection for sediment and corrosion.

The electrical panel is famously clean and well-organized from the factory, but any boat this age has likely seen substantial electrical additions. Inspect wiring quality around autopilot installs, electronics upgrades, and any inverter or lithium battery system — these are the most likely places where non-factory wiring may fall short of the original build standard.

Availability and Buyer's Takeaway

The Mason 33 trades most actively in the United States, particularly along the East and West coasts, with occasional examples appearing in the Netherlands and broader European market, reflecting the boat's appeal to serious European bluewater sailors. Because only twenty were built, active listings at any given time are few. Patience is genuinely required; waiting for a well-documented example with a known service history is worthwhile given the tight supply.

The boat rewards buyers who want a genuine passagemaker in a manageable size with strong construction credentials. It is not the right choice for someone who wants speed in light air, a spacious cockpit for racing crews, or easy engine access. It is a compelling choice for a couple planning extended coastal or offshore passages who want a boat that has been doing exactly that job for decades.

Buyer's checklist:

• Survey the iron internal keel carefully for rust, compromised bonding, and any evidence of weeping after groundings
• Inspect teak deck caulk seams and deck core moisture, especially around fasteners
• Confirm hull-to-deck joint integrity and toerail bedding condition
• Verify osmotic blister history and presence of barrier coat on the bottom
• Review full engine service records; inspect access configuration and fuel tank condition
• Audit all non-factory wiring additions, particularly autopilot, inverter, and battery systems
• Confirm propeller type and whether two-blade vibration has been accepted or addressed by the current owner
• Request documentation of any keel grounding history