Help to ID Korean mun.

Hi, need some help to id needed before buying.

Korea, 1 Mun, Sang pyong, General Military Office, series 7 ?
https://en.numista.com/catalogue/pieces142669.html

Also, fake or real?

If real, is it worth US$6,00?

Thanks

You have the right identification. I believe this is a real piece but a bit sad that it was cleaned somehow.
US$6 is a bit expensive for me but I think that's okay if you buy from European or American coins dealers, they also need to pay expenses to have the coins on their hand.

Chris