500 Zlotys Environmental Protection - Swan

Poland's Environmental Protection series, launched by Narodowy Bank Polski in the early 1980s, was one of the more unusual collector programs to emerge from a Warsaw Pact state — conservation-themed coinage sitting oddly alongside a government that had declared martial law just years prior. The mute swan had been a protected species in Poland since 1952, one of the earlier such designations in postwar Eastern Europe.

The .750 silver fineness is characteristic of Polish collector issues from this decade, a compromise driven by hard currency shortages that constrained what the state mint could allocate to silver content.