Either silver and gold plate. Or bronze / brass and gold plated.
Possible there is an antique room. In any case, it is very old and not a modern replica thanks to the excellent technical work. But the exact age is unknown. Sending carefully registered with insurance. The item "Celtic Celtic Gaelic Celtic Very rare fibula penannular brooch" is on sale since Monday, January 28, 2019. It is in the category "coins \ antique coins \ Gauloises". The seller is "gogocelts" and is located in bubenheim.This item can be delivered anywhere in the world.