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My Fault.

I completely missed the "B" in the Stencil.

This is a much later model.
2B would make it a 1977 year model and would positively have had an HIN plate attached to the outside of the transom.
http://www.whalercentral.com/articles...cle_id=101

And yes, this would have been made for the Overseas market.

I would contact Boston Whaler and give them your Stencil number.
They would then be able to give you a HIN number so you could have a new plate made.
Keep those emails for your records.

Enjoy your 1977 year model if that Stencil number is readable in your splashwell?
Any photos of the Stencil number?