Pre-war Gibson Mastertone Banjo Wrench
Excellent condition. Original, nickel plated, pre-war, early 30s,"Gibson Mastertone" banjo wrench/key used to tighten banjo head brackets using 1/4" hex-shape nuts. Used on TB-3, TB-4, and others for that period. It also has a wrench part end (7/16") which fits the coordinator rod nuts and the inside lug resonator nuts. Make you pre-war Gibson Mastertone complete or just add to your collection of banjo wrenches. Gibson only used this style for a few years in the early 1930s.
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