Baron Bliss Day: The stamp issued by British Honduras in 1973 of 3c shows us some yachts, most probably local yachts and not possible to identify during a race in Belize City on Baron Bliss Day.
http://mybelize.net/history/baron-bliss-day/
Mr Clem Reiss in Watercraft Philately 1981 page 30 gives on the stamp:
The stamp illustrates an unusual sail arrangement. The main sail on the lead boat would cause the boat to jib. A jib would place the crewman on the hiking strap in jeopardy of being knocked into the water.
British Honduras 1973 3c sg343, scott308.