What's the back look like?
Taking a pic and will post. I also had a brain fart. It's a little smaller than a dime.
It happens nice find!
Not the exact button, but might get you on the right track, no pun intended
I’d guess that it’s from N&W inustries, maker of work clothes, overalls, etc. Does it possibly say “Union Made” across the bottom?... that’s found on vintage work clothes from many different makers.