Seed pearls and silver in excellent mint condition!!!!Purchased in Japan I was told. There is no stamp of any kind. It has a unique closure where you pull the small dial/end out and the pin is slid/released out the side. To close you reverse the process. From what I’ve been told this is a trombone clasp used in the late 1800’s up to the 20’s-30’s. The pictures don’t adequately show the beauty of this pin.