17 Dec 20:
Sunfish Laser Inc (SLI) spun off from Pearson Yachts and were manufacturers of the Sunfish, Laser and and Day Sailer III from 1991-1996.
The DS III had extra flotation features incorporated into a different transom deck than the DS I and DS II, and a smaller cuddy opening. These differences were significant enough that it is not considered Class Legal for One Design DS events.