Thank you for cleaning it up with the dirt it was hard to really get a good idea of how it really looked. I am thinking it is an older style so I would use different wording when trying to look it up Like "vintage or antique" but I also wonder if it was an applique on a ribbon or does it have a tie tack style of pin to be attached to a hat or epaulet or does it have a brooch type of pin or no pins at all? which would make it more of a glued on applique which might indicate it came off a ribbon medal. I see you show California and the Bay area has a strong Navy history as does San Diego and many other spots so maybe it comes from a Navy club in the area possibly a membership pin?