Square holes centered on the frame rather than between frames would be super-8 film, introduced in 1965. 16mm with only one row of sprocket holes should have a soundtrack or magnetic strip.
So it's not original, not even to the period.
It's probably six frames from a commercially produced highlights film, made by castle films, or "Official films" neither of which are all that valuable.
Like this one
https://www.ebth.com/items/1357849-1...baseball-movie
Lets see, 18 frames /second, X 60 seconds times 10 min average length.... 10,800 frames divide by six.. 1800 lots at $50 each, $900 not bad at all!
I should ask my friend who does films to keep an eye out for a badly damaged one I can get cheap.
I don't have a copy of that film, but I do have a 16mm copy of an earlier Ruth film that's pretty cool. I'll have to get him to make a digital transfer and post it sometime.
Steve B