The guitar was bought on a garage sale in awful condition. The electronics did not work, plastic quard cracked in multiple places, the paint 80% damaged.
Now the guitar is in the fully working condition. Washburn humbucker pickups installed, a new plastic quard, the paint is restored. All the hardware is original.
According to my internet research Marlin SG guitars were discontinued in 1969. So I assume this guitar can be latest of this year.
Not interested in trade. I set a minimum price just to cover my expenses for the restoration.