Help identification Asian cash

Hello,

I need help for identifying this 3 cash coin, and if possible I would like to know the rarity and values.
The weights is: 6,4; 8,2; 6,5 gramms







Thanks in advance.

Hello,

Thank you for providing weight, but next time diameter would be useful too!

All three are Korean, from the Joseon Dynasty; the first and third are 2 Mun coins, probably this one:
https://en.numista.com/catalogue/pieces43871.html

and the second is a 5 Mun coin that doesn't seem to be in the catalogue.

Thank you for the useful info