This weighs 3.33 grams and has a diameter of 23 mm.
It was in a souvenir folder and the date "1690 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 1690 AD.
The weight does suggest 1 Mun, but that is about it.
I did look thru Mandel without seeing it. One rev character (T) is iffy, but may be arguably ok. One rev character (L) is just not what I'd expect at all and did not recognize.
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