Stedrling Silver and Black Onyx Brooch Signed on the back MK 925. At first i thought the brooch was Mexican, an now i am unsure...it may be an Americn Artist. The brooch has an S clasp on the back, and 2 bale loops for a necklace lso. i may be a Bird with the wing tucked under his head??? It is Very unusual, and looks great on. It is 2 7/8 inches wide, and 1 3/4 inches long.