1 Mon 'Kan'eitsūhō' Copper alloy, 小 'Ko' reverse

Obverse description	Cast copper-alloy cash coin of traditional East Asian form, featuring a central square perforation surrounded by a raised square border. The four-character reign inscription 寛永通寶 (Kan'ei Tsūhō, meaning 'Currency of Kan'ei') is disposed in the four cardinal positions around the central hole, reading top-to-bottom and right-to-left: 寛 (top), 通 (right), 寶 (left), 永 (bottom), rendered in regular script (kaisho) with boldly cast strokes. The field is flat and plain, enclosed by a well-defined circular rim. The coin exhibits a dark brown patina consistent with age and circulation.
Obverse script	Chinese (Kanji)
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Reverse description	The reverse is largely plain, with a flat field and a central square perforation framed by a raised square rim. The mint or foundry identification character 小 (Ko, referring to Koume-mura) is cast in the upper field above the square hole, rendered in a compact regular script. The remainder of the reverse field is devoid of further inscription, with the surface displaying an even dark patina and the characteristic smoothness of a cast flan.
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