A very interesting heirloom from a family that has gone down in the history of research on Polish medieval coins. Coming from the collection of either Zygmunt Zakrzewski or his daughter Jadwiga Zakrzewska-Kleczkowska (more information here).
A set of 8 era-cut Prague pennies (typical for circulation in Rus'), additionally with an assay cut, with an envelope of the assay office and a card with the results.