numismatic literature
auction catalogs
Fritz Rudolf Künker - auction 352: Die Sammlung Hermann Schwarz: Faszination des geprägten Goldes, Osnabrück 25.09.2021
218 pages + ads, hardcover, A4 format, auction catalog of gold coins and medals, among them the coronation ducat of John Casimir, 3 1/2 ducats of Danzig 1650, 3 ducats of Torun 1659