Genuine John Birch Biflux Neck Pickup. | Neck and Body Made By John Diggins | Full Size Backplate | Front & Side Jack Sockets | Genuine John Birch Neck Pickup Engraved "Biflux by John Birch" |. In addition to this, the collector who ordered the guitar managed to procure an original 1970s John Birch Biflux pickup for the build.
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