Obverse: Mercury and Knight in Armour with sword.
Reverse: Allegorical woman (Allegory of Industry).
Ostmark is the name given to a currency denominated in Mark which was issued by Germany in 1918 for use in a part of the eastern areas under German occupation during WWI, the Ober Ost area. The currency consisted of paper money issued on 4 April 1918 by the Darlehnskasse Ost in Kowno (Kaunas) and was equal to the German Papiermark. The Ostmark circulated alongside the Russian ruble and the Ostruble, with two Ostmarks equal to one (Ost)ruble.
The Ostmark and Ostruble continued to circulate in Lithuania from the end of World War I until 1 October 1922, when they were replaced by the litas.