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HIN's were not required till 1972. Prior to that date, the serial number was stenciled on the inside transom wall and in some models up forward.

A serial number is listed on the title. If the seller has the title, what is the number listed on the title?. Take the original title to Florida F&G.
Explain the boat is pre-72.

If you cant satifsfy them, go with the custom HIN.

My state did not "accept" the real HIN number from my boat, so I obtained a custom HIN. In the end, who cares. Just get the registration done so you can use the boat is my philosophy.