Discovered a stash of these new and unmounted A90 cartridges in the warehouse while looking for another piece of gear. Guess this happens when I don't get out of the shop much:) These are outstanding cartridges made with a revolutionary new manufacturing process at the time. Still unique in the cartridge world as far as I know. 
It is a strong, dynamic and very musical cartridge. Not sure there is a cart at this price that comes close to the A90.

MC A90 Technical data

Output voltage at 1 kHz, 5cm/sec.  -  0,27 mV
Channel balance at 1 kHz  -  < 0,2 dB
Channel separation at 1 kHz  -  > 28 dB
Channel separation at 15 kHz   -  > 22 dB
Frequency range at - 3dB   - 10 Hz - 80 kHz
Frequency response  -  20 Hz - 20 kHz + / - 1 dB
Tracking ability at 315 Hz at recommended tracking force  -  100 µm
Compliance, dynamic, lateral  -  16 µm/mN
Stylus type  -  Special polished Nude Ortofon Replicant 100 on Boron Cantilever
Stylus tip radius  -  r/R 5/100 µm

Tracking force range  -  2,0-2,5 g (20-25 mN)
Tracking force, recommended  -  2,3 g (23 mN)
Tracking angle   - 23°
Internal impedance, DC resistance  -  4 Ohm
Recommended load impedance  -  > 10 Ohm
Cartridge body material  -  SLM Stainless Steel
Cartridge colour  -  Black
Cartridge weight   -    8 g