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Beginning in late 1968 the design of the model 4001 began transitioning. Gone was the “horseshoe” treble pickup, replaced by a “high-gain” pickup bobbin with a magnet underneath it, instead of the magnetized horseshoes on top. Beginning in 1969, flat Grover tuners were substituted for Klusons, and were distinguishable due to the “ box” housing the tuning gears on the rear of the headstock and the wide metal bushings on the front. This all original example dates to February 1969 and is one of the first such transition models. Also new for 1968/69 was a black tolex case with blue velveteen lining. OHSC
