DM1 motor, S/N 2067. 

Can't fully test as I no longer have parts for this motor. When plugged into an MDR, it spins like its looking for a lens, but that is as far as I can test it without the drive gear or the delrin lens gear. 

FYI: Preston no longer services DM1 motors, but if you have some, and you want a spare, this could be a good pickup.

Selling it for parts/repair, and as-is.