They may look modern to us, but (worryingly!) they are already over forty years old. Well done for saving them.It's probably from the 70's but another new old stock saved from the trash.. I have a few more but don't know where they are stored?? or if they got sold in the auction??
It should have a tachometer generator but I cheat It is powered by a wall wart with a resistor in series plugged into the generator. The generator does run at 1200 RPM at 60 hzHow does that tachometer work? Is it a frequency meter, calibrated for a six pole generator?