Donald Healey didn't just produce exceptional sports cars. The production of the Healey "Sports Boats" by Donald Healey Marine was not exactly insignificant.
This is the cover of a comprehensive 1957 brochure.
There was also a small boat called the Sprite (of course) which was constructed of fibreglass.
Each boat came with a trailer made at the Donald Healey Motor Company with chassis number on an ID plate.