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BWCB6648M76i
3B0976

With the last letter being an eye, that would designate it being built in April of 1976 as a 1976 year model.
http://www.whalercentral.com/articles...icle_id=61

The bow platform is even different from the earlier models.
Smaller as it doesn't wrap around the console and the layout of the wood is crosswise instead of lengthwise.

(EDIT: added Stencil number above for future reference on this 1976 Sakonnet)