Large, Beautifully Curvy and Feminine Vintage Repousse Sterling Silver Dimensional Openwork Bow Pin or Brooch. This piece likely has Mexican origins, though it is not marked as such.
The brooch measures approximately 3 and 5/16 inches high, by approximately 1 and 11/16 inches wide, and roughly 1/8 of an inch deep, not including the pinback. (Included is a US Quarter in the photographs, for the measurement-challenged and ruler-averse.) Standard locking pinback. Stamped on the back, "925", unsigned. Weight is approximately 10.8 grams.
This brooch is in excellent vintage condition. It will have the expected light scratches and possibly tiny dings to the silver from normal wear. Hand polished, but may need further attention. The locking pin back works fine, and the pin is straight and sharp.