Hallo,
Ik zou niet te lang twijfelen over deze - volgens mij is die helemaal echt en behoorlijk oud.
De oudste Jazz Basses hadden maar 2 knoppen:
"The initial Jazz bass models had 2 stacked control knobs but in 1961 Fender changed to a three-control layout (two volumecontrols and a master tone control). Although some stack-knobbed Jazz basses were produced as late 1962 (when the old parts were eventually used up)."
Bovenstaand citaat geleend van: www.guitar-list.com, waar je ook meer info over andere details kunt vinden.
Greetz,
Han (not a bass player).