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Lots of incorrect information there.

The first Montauk was not made until 1973.
Also, the Stencil number was never on the outside of the boat.

3A5589 would make it a 1972 16 model but without any photos we can't tell you what model it is.
http://www.whalercentral.com/articles...icle_id=61

Here are the 16 models
http://www.whalercentral.com/faq.php?...p?cat_id=5