I have a vintage day sailer (i presume a day sailer 1). It has plank seats, a "double transom" with a drain plug draining into the cockpit, a small "floatation chamber" in the bow with a drain plug, and an external outboard mount, The deck is molded to look like wood, it has jam cleats in the wooden coamings, and cam cleats on blocks outside of the coamings.
The sail does not have a number, the trailer is from 1964, and the person I bought it from has no other info. I have looked at the DSA manufacturers specs and can't determine an age. There is no hull number or plate I can find.
David Britton (dlbritton-at-lucent.com)