However, a 1959 photo of an early Jazz Bass shows a 3-control setup as found on post-1961 models. Evidently, the design predates the stacked-knob design. In any event, Leo settled on stacked knobs for the first production models, and Fender Sales ordered them on March 3, 1960. Subsequently, Leo returned to the 3-control design, thus proving that tinkerers are never satisfied.