Ostruble (German: Ostrubel) is the name given to a currency denominated in kopeck and ruble, which was issued by Germany in 1916 for use in the eastern areas under German occupation (Ober Ost and the Government General of Warsaw). It was initially equal to the Russian ruble. The reason for the issue was a shortage of rubles. The banknotes were produced by the "Darlehnskasse" in Posen (now Poznań) on 17 April 1916.
From 4 April 1918, the Ostruble circulated alongside the Ostmark in the Ober Ost area, with 2 Ostmarks = 1 Ostruble. In the Government General of Warsaw the Ostruble was replaced by the Polish marka on 14 April 1917.
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The denominations available were:
The front sides of the banknotes carry a warning in German against forging banknotes. On the reverse sides is the same warning in Latvian, Lithuanian and Polish.
There were also 1 kopeck, 2 kopecks and 3 kopecks coins, made out of iron.
The Ostruble circulated in Lithuania together with the Ostmark until 1 October 1922, when it was replaced by the litas.
It was also still in use in a part of the Second Polish Republic during the first months of independence, until 29 April 1920.