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Great.

I see it is a Smirkless 16 hull with the wide narrow bow locker.
That would make it 1975 or earlier.

The Stencil number would be on the inside of the transom below the motor.
You would need to remove the paint from that area to reveal the Stencil number. Then you could send that to Boston Whaler to obtain your HIN number that was originally on the boat.

All HIN numbers start with BWC
See #III in this list: Model Year Format
http://www.whalercentral.com/articles...icle_id=61