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Japanese Kanei Tsuho 1 mon coins can be divided into two major categories: ko (å€, in English: old) and shin (æ°, in English: new)
The old 1 mon coins were minted from 1636-1668 (although the some private issues were as early as 1626) and can be very difficult to identify into varieties. The new 1 mon coins were minted from 1668-1867 and have much more varied calligraphy, so they are easier to identify.
These two major varieties are distinguished by the legs of the Ho (å¯³) character (see the pictures above - the legs are outlined in red).
In the case of the old 1 mon, the legs meet at the far right. Additionally, the old 1 mon tend to have "thicker" characters.
With the new 1 mon, the legs usually do not meet at all (sometimes, however, they may meet in the middle, but they are still easy to tell apart from old 1 mon)