Original 1966 Maestro Fuzz-Tone (Model FZ-1A) instruction sheet, produced by Gibson Electronics in Kalamazoo, Michigan, detailing operation, control functions, and internal circuitry for one of the most influential effects pedals ever made. This 4-page foldout includes wiring diagrams, stereo operation notes, tone/attack settings, and the classic transistor schematic—everything needed to unlock that legendary early fuzz sound. Dated “3-66” on the final page, this example shows light age wear, fold lines, and binder holes consistent with period use, but remains clean and fully legible. A highly collectible piece of vintage effects history, perfect for completing an original Fuzz-Tone package or displaying alongside any mid-’60s rig.