10 Zlotys Kazimierz Wielki Legends incuse, Trial Strike

The 1964 Polish commemorative program marking the 600th anniversary of the Jagiellonian University produced several trial strikes in varying compositions and relief treatments before the final production type was settled. This incuse-legends variant — with the inscriptions pressed into the field rather than raised — represents one of the deliberate design alternatives evaluated by the Mennica Państwowa during that approval process. Such trials were rarely preserved in quantity; most were melted once a production direction was confirmed.

The ParM and Fischer references both treat the incuse and relief legend variants as distinct catalog entries, which accurately reflects their status as separate striking decisions rather than mere accidents.