Silver St. Rupert Coin Sterling 800 Shanked Button

This old silver button was possibly made from an old coin and heavily oxidized.  It features an image of St. Rupert of Salzberg holding a salt-measure in his right hand, and a crosier in his left, and measures ¾” in diameter.  Post 1922, Austrian hallmarked RS, Toucan Head (W identifying Vienna), and 800 on shank.  Smooth back except for the shank.  Beautifully crafted and in wonderful condition!