This version with the plastic keystone button would have been used for 1950's date range production.
Kluson Deluxe Vintage Type Double Line Tuners - 6-in-line Set - Nickel or Gold
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Kluson Waffle Back Nickel Single Treble Side Guitar Tuner Aged Gibson Epiphone
Kluson Deluxe Vintage Type Double Line Tulip Tuners - 3-a-side Set
KLUSON TUNERS,VINTAGE 1950S 60S SCREWS "PHILLIPS" MARTIN,GIBSON,FENDER
