10 Zlotys Anniversary of Provincial Annexations Trial Strike

Poland's 1970 commemorative program marked the 25th anniversary of the postwar territorial reorganization — the Recovered Territories, as Warsaw officially called them — in which Poland absorbed former German lands east of the Oder-Neisse line while simultaneously ceding its eastern Kresy regions to the Soviet Union. Trial strikes like this piece were produced in alternative compositions to test dies and evaluate striking quality before committing to production runs, and most were retained by the mint or distributed through official channels rather than released commercially.

The copper-nickel trial designation across Fischer, KM, and ParM references confirms this as a documented variety, not an afterthought.