This weighs 5.94 grams and has a diameter of 29 mm. It was in a souvenir folder and the date "1731 A.D" was listed. While one side has the standard 4 characters for Korean cash coins, the other side does not match anything I can find in Krause, let alone for 1731 AD.
The weight does suggest 2 Mun, but that is about it.
@Marve65, yes probably buried for a time. Whoever made the folder made no effort to select good coins and I suspect made no effort to be accurate in their ID. At any rate, I have no money invested in this.
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