These are two surplus Dynapar encoders. The are E232048xx4x81. Which means 2048 pulses/revolution. I have copies of the spec sheet.
These were sold as new and as far as I can tell they are unused. I got for a DSC project but as with many projects not enough time.
The encoders are mounted on brackets and attached to a drum with a steel cable. There is also a plastic chain drive connecting to a
mult-turn potentiometer. I figured that I could attach the cable to a pulley on the mount to get smooth transfer of motion.
Asking $90 for the pair shipped to continental USA. Can use Paypal.