Navajo concho. There are no hallmarks such as "sterling" or a Navajo name. It is a stamped work concho. I think it can also be used as an accessory for your wrist. A large jump ring, large enough to thread a hair tie through, is soldered to the back. If you have any questions, please feel free to comment. It has tarnished and has dirty areas because I haven't polished it. The size is a little bigger than a 500-yen coin. The 500-yen coin is not included. Thank you.