This is a fabulous sterling locket pin. I have never seen one so large.IT is 3 3/8 by 1 5/8 and the pin is 2 1/8 wide. Opens up. The mark says B sterling handmade. Has a tiny hole on back made when caster for heat.IT just closes no latch. Much nicer in person.I think it is American and the B stands for the company that made it or person.The locket alone is 2 1/8 by 1 5/8 huge.