Spielkarten (German for "playing cards") are a type of underground currency utilised by black market traders around the world, though primarily within Oceanyka and its immediacies. Their origins lie in the first days of the Oceanykan Civil War, as the Oceanykan pound collapsed and became worthless. Though the Government continued supplying its armies with foreign weapons using gold, and food was rationed, much of the market reverted to barter and alternative currencies. One of these were playing cards from the Bayerisches Kartenunternehmen, a minor manufacturer in Germany, specifically their Munich-pattern 36-card decks from 1929. These cards are special due to their copper-coloured plastic covering stamped with the company's logo from the inside . After the war, a number of black-market traders continued using this specific model from this specific year as coin. The general rule is that each card is a unit of value, while the Ace counts as 10, so that the total value of a deck is of 72 cards. Later on, cards from the silver-coloured 1929 Silber Reichsieg Sonderedition (made to commemorate the 10-year anniversary of the Treaty of Versailles) were added to the list, acting as x10 the value, so that each deck contained 720 units of value. The final addition to this system was the gold-coloured, ultra-rare 1921 Deutsches Goldenes Jubiläum Sonderedition, each of its cards worth 100 times that of a 1929 card so that each deck contained 7,200 units of value.
While a direct correlation is impossible, 1 Spielkarten is typically equivalent to about £10,000 (OZP).