The Speso
For Esperantists concerned with international relationships the need for a currency with a fixed purchasing power was very important. To commemorate the 25th anniversary of Esperanto in 1912, the Swiss firm Holy Frères struck coins for the World Esperanto Association — the Speso (plural: Spesoj) — in the denominations spesdeko (10 spesoj), spescento (100 spesoj), spesmilo (1,000 spesoj) and spesdekmilo (10,000 spesoj). The First World War, however, put an end to this initiative.
Read more about this topic: Stelo