Weathers -- it says so. Interesting adaptor for regular headshell wires.
Weathers was a very interesting company that made very innovative products. Not sure if that is an FM pickup variant, but Weathers made capacitative cartridges that needed a demodulator which tracked at very low tracking forces and sounded very good, but were too weird for the general market. Euphonics picked up the design and then Sao Win. But it was always a fringe product, alas.