Analogue Tracer Cartridges

I recently purchased a Nottingham Spacedeck/Spacearm table. With it came a Tracer #3 cartridge. I had a Dynavector cartridge that I am currently using but would like to find out a bit more (SOMETHING) about the Tracer. Alas, I can find virtually nothing - including a less than informative reply from the U.S. distributor regarding this cartridge. Anyone out there that can provide some detail or forward me decent links (oh, I have searched!)? I'd be obliged.