Stop in for a cup of coffee

We were going thru a bunch of parts bins in the Hershey car show, and Ray had decided to buy a bunch of NOS ign. parts. One of us came across this tool, some sort of c clamp that fits in a bench vice. "Hey, that will be perfect for putting on those Dist. tags"! How much? One dollar!! Sold!!! And it is perfect. Evidently it is difficult to put those small rivets in place....Not any longer!!
Do not know what it was designed to do......
I think that’s a rivet tool for making blue jeans. I recall seeing them for sale in the needle trade shops that I used to buy my equipment and supplies from back when I was doing my auto upholstery business.