Vintage Sterling Silver Overlay Breast Collar Center Ring

Goodness is this ever stunning. This is a large, sterling overlay silver piece mounted over a breast collar ring. While its not branded, this came off of an older Blue Ribbon breast collar. The top is sterling with an intricate profile, lots of detailed engraving work, and raised center detail. In excellent used condition, shows some natural patina and has not been shined up. The back does show some annoying green patina common on silver overlay tack. Does have a faint sterling overlay mark. Measurements: Center Ring 1 3/4″, 3 3/4″ long by 3 1/8″ wide.