The Hryvnia or Grivna (depending on the region and dialect) were a type currency as well a measure of weight used in Kievan Rus’ and other East Slavic countries from the 10th century up to the later middle ages. The Hryvni/Grivnas were mostly made out of roughly cast silver and some times gold. What makes them rather interesting when compared to many other currencies of the period was their unusual shape, instead of being shaped like more common coins the Hryvni/Grivnas wold be commonly be found in three different forms from so-called “Triangular Novgorod Hryvni/Grivnas” which were long and thin, with a triangular spine. The round Hryvni/Grivnas were in the other hand more round than triangular but still long and thin. Then come the most weirdly shaped of the Hryvni/Grivna the so called “Kievan rhombic Hryvni/Grivna”, the name comes from their bizarre rhombic/hexagonal shape.
I made this as a simple side project in between other larger ones while I was learning about the history of different monetary systems, this is when i found out about the Hryvni/Grivna.