This is a gorgeous vintage Art Deco era pin or brooch in sterling silver set with marcasites. It is rectangular and features a pierced floral design. It is beautifully detailed and it is marked Sterling on the back along with another mark that I can't make out. It fastens with a rollover safety catch.
It measures 2 inches by 1 1/4 inches and it is in very good condition. There is some patina on the silver and there is one tiny missing marcasite - very hard to see.