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You should be able to identify a Montauk model.
See the Montauks here:
http://www.whalercentral.com/userphot...lbum_id=14

See the 17' models Stencil numbers here.
http://www.whalercentral.com/articles...icle_id=17

It appears yours would be a 1994 year model.

The only way to find your HIN number would be to contact Boston Whaler and give them your Stencil number. They can cross reference and then give you the HIN number.
You could then have a new HIN tag made.
http://www.whalercentral.com/articles...cle_id=103