1973 GIBSON EB0 BASS
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Sometime after April the bridge began transitioning from a two pole tune-o-matic to a three pole with no mutes, still including a chrome bridge cover. Sometime after then the unbound 21 fret rosewood fretboard changed to 20 frets. Both versions included pearloid dot fret markers.
Other 1973 EB0 characteristics: Larger headstock including gold silkscreened Gibson logo with "i" dot connected to the "G" and open "o", "MADE IN U.S.A." stamp on back of headstock beneath the serial number, Schaller M4-S open gear tuners or Kluson riveted tuners with flat head screws, two screw plastic truss rod cover with no model name, volute on headstock back, glued in neck, large chrome four pole humbucker pickup with black plastic surround placed away from the neck butt, black/white/black pickguard with curve at bottom end, two silver top/black witch hat shaped knobs with numbers, volume/tone words and metal position pointers, CTS potentiometers, small "red drop" capacitor, grounding foil in pots cavity, metal or plastic input jack on body front, strapholder on body back, five screw plastic controls access cover on body back, molded black Gibson name case with purple interior.
Gibson shipped a total of 1006 Cherry, 396 Walnut, 5 Natural and 1 left handed Walnut EB0 in 1973. For 1973 serial numbers see the "Gibson Serial Number Chart". For more precise dating cross reference the serial number with the instrument's potentiometer codes