I bought this silver object some time ago from an vintage shop. I’m not sure if it is really a button or some sort of clip or fastener for clothing. It has a hinged system on the back, that could maybe hold some fabric in between the two movable parts. I kept searching for something similar, to see what could have been its purpose, but with no luck. I have only found a listing for quite similar objects and the seller calls them “buttons”. I wear it as a pendant and I like it a lot.