The one I have looks like the OM body cartridge, but its silver and has a non user replicable stylus.
So it’s like this, but without replaceable stylus?
Here is the specs for "U"
Interesting that these type of cartridges were popular back then, so many manufacturers made "OM-alike" design, but most of them were MM.
SONY made an MC-1 and MC-3 with, but my personal favorite are MM XL-50 with Boron Pipe (and very rare XL-70 with Sapphire cantilever). I was lucky to find a few NOS samples of XL-50, now I hope to replace my XL-70 with NOS unit.
Accutex (Azden) cartridges have the same "OM-alike" design.
Stanton and Pickering also made something similar.
The Ortofon MC200 is even worse with an output voltage of .09 mV. But it uses some pretty snazzy technology for a cartridge this age. Boron cantilever, fine line nude (line contact) stylus, samarium cobalt ring magnet, and Ortofons WRD damping system which is still found on their higher level cartridges today.
I never tried Concorde or OM MC200, but I have Ortofon MC2000 with terribly low output too, and all the advanced technology of that age. MC2000 is completely different from MC200.
the Fidelity Research MC202 with an output voltage of .13 mV. These are tough output voltages to work with, but I wonder if the low number of coil windings is what contributes to the wonderful sound of those cartridges. At that time you likely had to use step up transformers. In my case I have an Esoteric E-03 phono stage that can handle those low voltages.
Besides the FR best 7f and 7fz, I enjoyed PMC-3 and now discovered the MCX-3 designed by Ozawa (now Shelter) which I posted in FR dedicated thread recently.