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Absolutely can't go by titles. Just the way it was back then and even now for some older models that have lost their titles.

Blue interior hulls had white stencil numbers.
Desert Tan and White hulls had black stencil numbers.

Yours would be white.
Again, you can find many photos in the members personal pages.
You can look at all the 16 models to find a stencil number somewhere. If I find one, I will post it for you.

Boats prior to October 1972 did not have HIN numbers.
They only had Stencil numbers for identification.
http://www.whalercentral.com/articles...icle_id=61

The only way to find out what model this boat was when it left the factory is to contact Boston Whaler and give them your stencil number. Unfortunately, you do not have the stencil number at this time.