50 Sen

Japan suspended the gold standard in September 1917 following pressure from wartime capital outflows, and these small-denomination Sen notes were part of the resulting push to conserve metal coinage. The Government Printing Bureau produced the series domestically throughout the period, which was still relatively uncommon for Japanese paper currency at the time — earlier issues had frequently relied on foreign printers.

The notes are prone to foxing and edge toning from humidity, a known condition pattern with this series that collectors should expect rather than treat as exceptional wear.