5 Sen w/o block number

Japanese military currency for occupied territories was typically issued with block numbers to allow authorities to track and, if necessary, invalidate specific batches. The absence of a block number on this 5 Sen note is not an error — it identifies it as an early production run from 1940, before the systematic block-numbering conventions were fully applied to the lower denominations. The Cabinet Printing Bureau produced several series variations across the occupation currency program, and distinguishing them correctly depends entirely on these small typographic absences rather than any visible design change.