I'm with the above!! It's a lock part... Yale & Towne ....Y&T inside what looks like a clover is their mark.
What type? I haven't found a match. I'll try to link a pic that shows the company mark.
https://en.wikipedia.org/wiki/Yale_(company)
After exhaustive research (at least 10 min.) I have come to the conclusion that it's a treasure chest lock!
The company did make travel trunks or at least had their locks on them,
Or maybe even a lock off of an old "man purse" (Don't know what they are actually called
)! Satchel? type bag where that was mounted on a leather strap even?Document bag(?) Maybe? The twist looking knob reminds me of a bag or something that I've seen in the past somewhere on something. Can't remember what it was.......