@that_coin-dude, yes, you are right! I forgot that the older ones were quite different. it is a 1 Mon, c#1.1 (1626-1769), with a plain reverse, or one with the markings worn off.
I believe your coin is a Japanese, Kanei Tsuho,around AD 1768. But certainly 18th century. Commonly called a 'Tiger Tail' in view of the upper character's long tail.
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