Can anyone offer some ideas on this motor? My dad has it in his barn and he doesn't remember when/if/what he used it for.  Thank you!

Looks like an old Hiawatha, somewhere between 3 and 5 hp.  Other than being old, anything else you might want to know about it, I don't have a clue.

 

^^^this^^^ 1950’s model, 1 cylinder 3.5 hp, 2 cylinders 5 hp.

Tom