Shoal draft: 4.0′.

Many were originally sold to charter fleets and sailing schools.
Some boats have iron instead of lead ballast.
Also built and sold in Brazil as TRINIDAD 37.

3rd at 1979 3/4 ton cup.

Thanks to Max Crittenden for providing this photo of his own MARTIN 32.

IOR 3/4 ton.

Shoal draft, sheel keel version: 4.33’/1.32m.

In addition to the taller rig and increased ballast, this model featured a redesigned rudder which accounts for it’s greater listed water line length.(unmeasured by the IOR) Later still, the interior was changed which included, among other details, an extended port side settee with removable dinette.
After Yankee Yachts went out of business in 1975, a few boats were built by Heritage Boat Works and Vashon Island Boat Works, both of Oregon, USA. (Rig dimensions listed here are from the MK III published sailplan though they are not necessarily consistent even within this particular version.)