Alan Entwistle AS57 Bridge Pickup.
This is Entwistle's take on the classic Alnico single coil pickup, utilizing their proprietary winding technique. Starting with staggered Alnico V poles and a fibre board bobbin structure, they scatter wind the coil directly to the magnet core, resulting in a pickup that catches all of the vintage characteristics, nuances and subtleties of the originals.  Black.  Bridge DCR:  5.7K.  
Bridge Pole Spacing: 52mm.  
Springs, screws and wiring diagram included.  Free USA Shipping.