Workshop history https://asiamedals.info/threads/orders-of-saint-stanislaus-made-by-vincenz-mayers-soehne-wien.26445/
3rd class order.
Silver, enamel.
Size 65.5 mm.
Suspension and badge marked with an Austrian silver hallmark from 1867+ time period "Diana head with a number 2 and letter A" where 2=900/1000 fineness and A=Vienna.
Original case.