10 Sen - Shōwa

Japan's wartime material shortages pushed the mint toward increasingly unconventional solutions by 1944–45. Copper and aluminum had long been diverted to the military, and this porcelain 10 Sen — fired ceramic rather than struck metal — was one of the most radical emergency coinage experiments any major nation attempted during the Second World War. Production was never completed before the surrender in August 1945, and these pieces did not enter circulation.

The KM#Pn79 designation places it firmly in pattern territory. Surviving examples come almost exclusively from mint holdings distributed after the war's end.