Japan, Ryukyu Islands: 100 Mon, ND (JNDA2008-134.1, KM-C100)This coin was issued by the Shimazu-clan between 1862-1863. Ryukyu Islands is also known as Okinawa. It was conquered by the Shimazu clan around the 1600s and hence was subjected to taxation up until the 1870s.
Obv: 琉球通寶 (Ryu Ku Tsu Ho)
Rev: 當百 (To Hyaku; value 100)
Edge stamped with サ (sa), the first syllable of Satsuma, the domainal country of the Shimazu-clan
A high-resolution image of this coin is available at
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FORVM Ancient Coins