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Hi Mitch,

No, the interior was not blue.
Does not sound like a 1976 year model.
http://www.whalercentral.com/faq.php?...p?cat_id=5

See this on HIN and Stencil numbers:
http://www.whalercentral.com/articles...icle_id=61

Sounds like you have a Custom model as the interior is not original and unknown year at this time.

Here are the 17' Sport models starting in 1976.
http://www.whalercentral.com/userphot...lbum_id=46

Sounds like you can customize this hull anyway you want and create your own "Custom" model.
Let us know what you do.