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Looks like a Sport model to me.

The entire railing system is aftermarket so if you take that off, then your boat would look just like this other 1972 Sport model.
http://www.whalercentral.com/infusion...er_id=5261

Your HIN should be embossed in the hull rather then a tag.
It should be just above the hand grip.
http://www.whalercentral.com/images/p...791/14.JPG
http://www.whalercentral.com/images/a...bossed.jpg

Might want to confirm your numbers with Boston Whaler just to be sure.
Can you verify the Stencil?
I question the 9394. Is it possible it could be 9894? Photo of Stencil?

Congratulations and welcome aboard WhalerCentral.