All good info. One thing I'll add is that the USCG will recycle HIN builder codes if a builder has shut down.
If we could find a list of recycled builder codes, or an HIN registry from the early '80s, we should be able to give this fellow an answer.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT