Two works by Marian Gumowski in one binding.
- "Numismatic-historical sketches of the 11th century". - edition 1924, Poznań; pages 257;
- "History of the Cracow mint" - edition 1927, Poznan; pages 127 + 18 plates;the rarest and most valued monograph, from the series of monographs of Polish mints .
Inside an ex-libris of Józef Sawicki, whose collection of Polish coins and medals was auctioned in New York in 1980.