Sigi (Siegfrido Pineda) worked briefly for Los Castillo and Salvador Teran and then Margot, before opening his own Shop Plateros. The brooch has a Beautiful Design raised with an oxydised back, and it is marked Sigi on the back. Some of the other markings are smudged. There is 92..the 5 is missing, and the other marks are smudged. (I think an eagle) The brooch is 2 1/8 inches and is in lovely Vintage Condition. There is a lock on the pin back.