This stamp for the Labour Day festivity in British Honduras shows us a rowing regatta in Belize City, The craft used in the regatta, with as it looks have a square bow is most probably a “batteau” , a term in Belize applied to a “pitpan” that has been enlarged by sawing it in half longitudinally and inserting a wide plank. May require up to 40 paddlers.
British Honduras 1973 10c sg344, scott309.
Source: Aak to Zumbra a Dictionary of the World’s Watercraft.