This is marked Mexico Silver on the back of the mans coolie hat. I was told it was sterling....do not know if silver means the same as sterling. About 2.5" sq. The balls articulate/move. Pin bar and clasp work fine. No damage to note...could use a cleaning. The detailing is great. Please check the pictures as they are part of my description. I try to note all conditions but I could miss something. Has some weight to it....this is not a flimsy pin. Questions? Please ask prior to bidding.Paypal only please. Payment to be received within 3 days of auction end. No e checks please. Will ship only to USA verified addresses. Please check out my other auctions. I will be listing more vintage jewelry over the next week or so. I am almost 70 and it is time to pass these beauties on. Thanks for looking.