I found this on a property that was a farmstead from the late 1800s through about 2000. Seems to say "QRS" on the top and "U.S.A." on the bottom. Nothing on the back side. Made of copper, I believe. Seems to have a tube on both sides, but no opening through it. What do you think?
It is odd that the "R" is smaller than the other letters and has a period (dot) on either side.
If that really is "USA" as in "Made In USA", I think that typically would put it firmly in the mid-twentieth Century (basing that on my knowledge of cast iron cookware dating), but it certainly looks older than that by the patina, the style of lettering, and the material it is made of.
OK, I think I've got it! I wasn't able to find a photo of the piece with the company name embossed onto it, but I did find this patent drawing. The item is a spool flange for the ends of player piano rolls. Patent date 1922.