The following is a segment from Paul Gilkes' cover feature in the November Monthly issue of Coin World, dealing with World War I and the many numismatic collectibles that are related to that war.
Monetary concerns during World War I included the production of emergency currency issues in paper and metal form.
Some issues were to pay troops, and others to transact business in the areas where the money forms were executed or distributed. Some were used in prisoner of war camps.
As German military forces trekked through Belgium and Luxembourg on their way to capture Paris, the invaders needed emergency currency.
Some examples of these notes were printed in two languages and denominations.
One Luxembourg note has bilingual inscriptions that identify its combination 5-franc/4-mark denomination. The denomination of 5 francs was equivalent to 4 marks.
A Fine example sold in a Feb. 22, 2011, sale by Heritage Auctions for $74.
At the beginning of World War I, when the German army occupied part of the Russian Baltic region, residents of the occupied areas were not willing to give up their gold-backed Russian Czarist rubles.
These rubles were worth twice as much as the German mark. The Germans “would redeem ruble bank notes for gold to help finance the war, while at the same time devalue the money of their enemy,” according to Frank Passic in the Winter 1999 issue of the Central States Numismatic Society’s journal, The Centinel.