Gibson '57 Classic Underwound (Double black, Nickel Cover, Underwound, 2-conductor, Potted, 7.2k, Alnico 2)From Gibson's Original Collection Since their introduction in the 1950s, Gibson's famous "Patent Applied For" humbucker pickups have been considered the ultimate pickup because of their smooth, velvety tone. The '57 Classic Plus uses slightly overwound coils, exactly like the original Patent Applied For humbuckers of the late 1950s that accidentally received a few additional turns of wire. The balanced coils of the 57 Classic Plus give them a warm,