During the 50s KLUSONS were stamped with "KLUSON DELUXE" in the center line over the little hole - the so-called "Single Lines" tuners.
Single Line, by Gotoh.
Varieties: 6-left, M6VRN 6-right (nickel only)
Colors: nickel, gold
For old Juniors. Oval buttons.
Varieties: 3+3
Colors: nickel
For old Les Pauls. Tulip buttons.
Made by Gotoh. WeiĆe, oval plastic buttons.