Charles Ferdinand Vasa (1648-1655), 1/4 thaler, 1654, Opole; Av: Bust, legend around; Rw: Coat of arms shield, date and inscription around the sides; F.u.S. - not noted, Gumowski WN 1/1965 in article "Coins, medals and seals of Charles Ferdinand Vasa" item 61, Hirsch "Silesia in Nummis" -, Kop. 6489 (R8) c.a., Strieboll - not listed; silver, 7.08 g; unique coin, in beautiful state of preservation, sought after by collectors, not available for almost 40 years on the numismatic market.