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Yep, April comes after March and before June.

The HIN tag was put on in April as signified by the last letter, eye.
May would have had a J for the last letter.

I saw the transom plate and the 120hp motor.

Not sure what you are going to find out about the front platform.
I have never seen a factory one for the Sakonnet 17'.
All the Smirkless 16 platforms probably will not fit properly.

Congratulations on your purchase.
Now you have a 1975 Montauk and a 1976 Sakonnet.