That's so early in the pickup history of Gibson pickups that I could only speculate. From looking at the coil, it does appear to have a very even and deliberate pattern to it. Also interesting is the way the coil start was constructed on that one. The start lead went though the bobbin into the inside of the coil and wrapped around the bobbin nearly a full turn, just like PAFs. Only in this case it was a AWG 20 or so cloth covered braided wire, like a Fender pickup would have, so it was a VERY significant factor in the overall shape of the coil. In more modern vintage Gibson single coil pickup history - I just love these bobbins! Not the most amazing sounding P-90s, but still a very cool jangly sound and they look so damn cool!