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Hello and Welcome to WhalerCentral.

To begin with, there is no such thing as a 1972 Montauk as they were not made until 1973.
http://www.whalercentral.com/userphot...lbum_id=14

So, you must have some other model that was called a 16' instead of a 17'.
See this FAQ:
http://www.whalercentral.com/faq.php?...p?cat_id=5

You should be able to tell what year and model it is by looking at the Stencil number and the models section.
Here is info on Stencil numbers:
http://www.whalercentral.com/articles...icle_id=61

And here is info on the different models:
http://www.whalercentral.com/userphot...allery.php

Let us know what model you have so many members here can help you out better.

Congratulation on your purchase of whatever model it is.