Re: Were Dual Adjustable Fillister Coil JBJs Factory made?
Yes they were. I have a much later one that is not MJ wound. You can have them custom ordered from the custom shop floor model. This are very close to the Allan Holdsworth pickup (AH1BJ) that was made during the same time period (which i have 2 of those).
Some people did make their own double fillister screw JB's but looks like that one is factory made.
Nice find-just need to add some lead and you are good to go!