Division II boards were made in the 80ties, they are about 3.90 meter long, 60-70 cm wide, have a round bottom shape and a daggerboard. Mistral use to make one called the M1. See pictures of a few of these boards here
. They are much faster than a sailboat upwind and downwind, very enjoyable in light wind condition, harder to control in wind above 15-20 kts, although they are manageable.