Offshore Mk II Information, Review, Specs

The Mk II is distinguished from its predecessor, the Mk I, by subtle but significant deck molding changes and interior refinements intended to maximize the utility of its compact hull. It remains a popular choice for solo sailors and couples looking for a low-maintenance, "chunky" vessel that can handle weather better than almost any other boat in its size class.

Sailing Performance & Handling

The Mirror Offshore Mk II is frequently described as a motor-sailer rather than a pure performance yacht. With a displacement-to-length ratio that leans toward the heavy side, it is not a boat for light-air finesse. Instead, it offers a sense of security and "big boat" motion in a chop. The hull features a long shallow keel assisted by two small bilge plates (shoes), which allow the boat to take the ground upright—a critical feature for the drying harbors of the UK and Northern Europe where many of these vessels reside.

In terms of handling, the Mk II is remarkably forgiving. According to editorial insights from Practical Boat Owner, the boat is "surprisingly stiff" thanks to a high ballast ratio, though its windward performance is hampered by the shallow draft and substantial windage of the high topsides. Under sail, it tracks reasonably well but requires a stiff breeze to truly wake up. Most Mk IIs were originally fitted with small inboard diesel engines, such as the Volvo Penta MD1, which reinforces its identity as a vessel meant to chug through a calm just as often as it sails. The steering is typically via a transom-hung rudder, providing direct and mechanical feedback, though owners often note that the boat can be heavy on the helm when over-canvassed.

Interior Comfort & Variations

For a vessel under 20 feet, the interior of the Mirror Offshore Mk II is an exercise in clever spatial management. The "Mk II" designation brought a slightly revised cabin trunk that offers surprising sitting headroom for an adult. The layout generally consists of two full-length settee berths in the main cabin, with some versions squeezing in two additional pipe cots or a V-berth arrangement in the bow, though the latter is best reserved for children or storage.

The materials used are typical of the era: teak or mahogany trim against white GRP liners. While the space is undeniably tight, the Mk II managed to include a small galley area and a dedicated space for a chemical toilet—luxuries rarely found in 19-footers of the same vintage. Its sibling, the original Mk I, is nearly identical in hull form but often lacks the more ergonomic cockpit drainage and refined interior moldings found in the Mk II. Another close relative is the Seamaster 19, which utilized a very similar hull mold but often featured different deck layouts and trim levels.

Known Issues & Buyer’s Checklist

Prospective buyers of a Mirror Offshore Mk II should approach the vessel with an awareness of its age, as many of these boats are now over 50 years old.

• Window Leaks: The large acrylic cabin windows are a known weak point. The original rubber seals often perish, leading to water ingress that can damage interior woodwork and soft furnishings.
• Deck Core Integrity: While the hulls are famously "over-built" and thick, the decks can occasionally suffer from soft spots if hardware has been mounted without proper sealing, allowing water to penetrate the balsa or foam core.
• Engine Serviceability: Many Mk IIs still carry their original Volvo Penta MD1 or Petters engines. While reliable, parts are becoming scarce. Buyers should check the engine mounts and the stern gland, as these are often neglected in such small vessels.
• Chainplates: Given the boat’s age, the stainless steel chainplates should be inspected for crevice corrosion where they pass through the deck, as a failure here can lead to a rig loss in heavy weather.

Community & Resources

The Mirror Offshore maintains a dedicated following among traditionalists and "small boat" enthusiasts. The most prominent hub for technical data and historical records is the Mirror Offshore Owners Association, which provides a repository of original brochures and modification advice. Additionally, the Van de Stadt Design archives continue to recognize the Mirror Offshore as a significant milestone in their historical portfolio of accessible cruising designs.

The Verdict

The Mirror Offshore Mk II is not a racing machine, nor is it a luxury yacht, but it is one of the most capable and rugged small cruisers ever produced. It is an ideal vessel for those who prioritize safety and seaworthiness over speed and contemporary aesthetics.

Pros:

• Exceptional seaworthiness for its size.
• Ability to dry out upright on its bilge shoes.
• Low cost of ownership and easy trailering (with a beefy vehicle).
• Classic Van de Stadt lines and robust GRP construction.

Cons:

• Poor light-wind sailing performance.
• Limited windward ability due to shallow draft.
• Interior space is cramped for more than two adults.
• Original inboard engines may require expensive replacement or specialized maintenance.