100 Złotych - Rybek Tilapia Nilowa 2015

Rybek is one of Poland's handful of functioning local complementary currencies, circulated within a small community exchange network rather than through any state banking channel. This piece — denominated in a unit that cannot be spent at a supermarket — occupies an odd corner of numismatic taxonomy: legally a medal in most jurisdictions, treated as currency within its issuing community, and collected internationally as neither.

The Nile tilapia framing is almost certainly a nod to the fish's role in alternative and sustainable food economy discussions prominent in Polish ecological circles around 2014–2015.