I think it's for sure a watch. Maybe, nickel or silver. Memory stinks swiss? I think, or has the look of the case. There were a lot of smaller ornate pocket watch type watches. Used in jewelry too, like mentioned above. I'll look real quick later and post a pic if I can find one the same or similar. I'm not very organized! Some had really ornate dials and hands also.
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Sry, took pics in a hurry, and didn't want to play around with the camera. I grabbed a few from the project drawer that might be similar. Some a little bigger, but there are many, many different kinds and made different metals. Most are from later 1800's to early 1900,s.
If your careful, and find the seem on the back, it might pop open fairly easy. From there you might find numbers,name,marks that will identify it.
Again, I could be wrong too. But I really think it's a watch from what I see in your pics. I think I can see the crown(winder) and where the bow(loop thingy) went on. Most of that type weren't screw backs, but just in case, if there is no hinge showing try to unscrew or get back to turn first.Before trying to pry it open, like the kind that snap on.
Cool find!!! And to someone like me, holds more historical value and curiosity than anything else!!!!!