Do you have the hull number of this Corbin please ?

If it is from 1979 my guesses are #7, 15, 19, 20, 27, 29, 33, 34, 39, 40. Many of those were finished but it is a process of elimination to identify the unfinished ones.

The full hull stamp will be something like "ZCJ000010179" and will be on the stern, high up near the cap rail.

regards, pp