A fact from Japanese government–issued currency in the Dutch East Indies appeared on Wikipedia's Main Page in the Did you know column on 26 December 2014 (check views). The text of the entry was as follows:
Did you know... that during its occupation of the Dutch East Indies, the Empire of Japan issued both gulden and roepiah (example pictured)?
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The currency circulating in the Netherlands Indies prior to the Japanese invasion was called "gulden" in Dutch and "roepiah" in Indonesian. Hence, the Japanese occupation notes with inscriptions in Dutch apply the name "gulden" (and "cent"), while the notes carrying inscriptions in Indonesian apply the name "roepiah". Some notes were highly localized; 100 and 1000 gulden notes, with a design similar to that used in occupied Malaya, were only meant to be circulated in Sumatra (though there is no evidence that the latter were actually in use).[1]