Korpa 
For the first few years of their production, Gibson’s famous “Patent Applied For” humbuckers were wound using imprecise machines, resulting in pickups with slightly different output and tone. They were – and remain today – as very desirable to players who want to mix and match and explore a complete spectrum of tonal possibilities. The ’57 Classic vintage style humbucker is the result of Gibson’s drive to capture and recreate this renowned characteristic. Introduced in 1992, the ’57 Classic provides warm, full tone with a balanced response, packing that classic Gibson PAF humbucker crunch. They are made to the exact same specs as the original PAFs, including Alnico II magnets, nickel-plated pole pieces, nickel slugs, maple spacers, and vintage-style, two-conductor braided wiring. The pickups are also wax potted to remove all internal air space and any chance of microphonic feedback.
While this timeless beauty gives you a tone that is warm and subtle with full, even response, it doesnt hold back when you need that classic Gibson humbucker crunch!
The 57 Classic features Gibsons special Alnico II magnet, vintage enamel coated wire, nickel plated pole pieces, nickel slugs, maple spacers and vintage-style, two-conductor, braided wiring. The 57 Classic is available with genuine gold-plated covers, nickel-plated covers, or open coils.