[1][2][5][6][7] The design was built by Seafarer Yachts in the United States, starting in 1968, but it is now out of production.
[1][2][5][6][8][9] The Seafarer 31 Mark I is a recreational keelboat, built predominantly of fiberglass with a solid hull and balsa-cored deck, with wood trim.
The hull has a spooned, raked stem; a raised counter, angled transom, a skeg-mounted rudder controlled by a tiller and a fixed fin keel.
[1][2][5][6] The boat is fitted with a Universal Atomic 4 30 hp (22 kW) gasoline engine for docking and maneuvering.
The galley is equipped with a two-burner stove, an ice box and a double sink.