I bought a C F Mountian in a pawn shop in Indianna seven or eight year ago. It has "Mountain Folk" Stamped inside, and in Large MOP Letters it has "Yahashi down the center of the headstock, the way high end Martins have "Martin" on the headstock. This guitar appears to be a copy of a Martin D-41 with the same type headboard and large MOP markers on the fingerboard. But it has the three piece back of D-35. It's a late sixties to mid seventies guitar. It has been an excellant guitar for me. I'm always looking to find out more about these Mountain guitars.