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Not necessary.
Many older boats registration is not correct.
It might have been sold for the first time in 1967 and they just neglected to put the proper year model down.

Enjoy it...
Now, what model is it?
Have you looked through the Whaler Model Specifications link on the left sidebar?
Look at all the 16' models and let us know.
If you can't recognize it, then someone has customized it and it is now a Custom 16' model.
The interior determines the model as the hulls are basically all the same during those years.