Okay, I have two guesses, Vic and Mustang.
Vic my feeling is that your sweet find is from somewhere in the mid 60's.
Mustang I'd bet that yours is a touch later, late 60's to early 70's.
But BOTH you gents please remember, I was wrong once before...
Thanks! It's great to know there are people out there who still admit when they were wrong...that one time. It keeps ya humble.