Nice find!
I believe that's something used to press on watch back closures. Its called a watch press or something like that? I've seen something like it in watch supply shops where I pick up some of my craft supplies (jewellers rouge, polywatch abrasive and I do mess around with changing my watch straps out often so I needed tools for that). I have asked to look at one before because I was thinking of using it simply as an arbor press.
Anyway, I digressed... some watches have backs that snap/push-press on as opposed to screwed on case backs. They are not very water-tight but it works to hold the movement in the case back. The press is designed to apply even pressure to compress the back plate onto the case. I believe dies would normally be attached corresponding to a watch being worked on so everyting comes together perfectly?
That press could be useful for die-cutting pouches? It could also be used to emboss brands and designs on leather if you have the dies. I suspect you may also be able to be use it to evenly flare out tube pins for a slingshot or knife handle installation with the right dies...
I don't know why I have so much useless information in my head
