[widgeon13]

It could be almost anywhere and the NC number is most likely not traceable today. Aircraft type and any serial numbers would be helpful as well as year of manufacture. He most likely does not have his log books from back then and I'm not sure he would have even kept track of hours in the early days.

My father-in-law had a Waco on floats in upstate NY that ended up on the west coast and a Ryan-St that is now in a museum in NE.

Your Dad's could also be in a barn in pieces waiting to be restored and flown again.

Keep looking and asking questions, it will be a great mystery/story whatever the outcome.