On the front wall of my 1968 Starfish cockpit are 5 small holes. I saw the same thing on a picture of another Sunfish or clone. What was this? Is there any reason I shouldn't plug them?
My guess is the outside 4 are screw or rivet holes for the missing ID plate. The 5th hole is the vent hole. That keeps the boat’s seams from popping on a hot day.
I agree with Beldar. This was probably a Starfish builder's plate. Dab a little silicon goop over the four outer holes but leave the center hole open so
the inner and outer air pressure can equalize as the temp. changes.