1975 21' Aquasport Hull #

[captaincahill8]

Hello everyone! Does anyone know where the secondary hull number would be for a 1975-1976 21' Osprey?

I picked up an old girl for $250 and the transom plate was lost due to a transom replacement.

I would appreciate the help if anyone knows!

[RickK]

I don't remember when they started putting the "stamp" in the mold so when they pulled the hull from the mold the "stamp" was imprinted in the gelcoat on the transom. My '92 has it.
I've read where there was a second HIN hidden under the rubrail on the port side a couple feet from the transom.