Hey everybody! I'm looking for some help in trying to figure out what Seymour Duncan's I have and from what time period. They are 2 zebra humbukers that seem to be maybe from the 80's just by the look of them? On the back of one is a JB-D (I'm not sure what the D stands for) and the other pickup has DC-M which I could find no information on. The pickups don't have the Seymour Duncan logo on the front which tells me they are older. Pulled them out of an old 70's les Paul. Any help identifying them and thier circa would be really helpful. Thanks in advance.