The one sen coin (一銭) was a Japanese coin worth one-hundredth of a Japanese yen, as 100 sen equalled 1 yen. One sen coins were first struck for circulation...

The 50 sen coin (五十銭硬貨) was a Japanese coin worth half of a Japanese yen, as 100 sen equalled 1 yen. These coins circulated from the late 19th century...

Japanese). Retrieved December 23, 2020. The Japan Daily Mail. 1906. p. 228. "稲一銭青銅貨 (1898)". Pepper's Square. Archived from the original on July 22, 2020....