Hello to all. First time poster. I hope Im posting correctly and not hosing-up the SD World Order. Anyways, I picked up an early eightys Epiphone Firebird at a yard sale, and someone had installed a SD humbucking pickup in the bridge position. It's a black open coil, with a singel row of nicklel slot head screws. On the reverse there is the SD logo etched into the plate with a single sticker with B-J. I have been researching prior posts, and the xref chart for pickups, and do not see this specific reference. This pickup ohms out at 13.46. It's has great clarity, bite and attack. (I put in my SG out of curosity, and it's going to stay. Much better definition than the 498T. Anyone have any ideas what this might be? The person I bought it from also purchased the guitar with the SD installed, so no help there.