4-1/4 Inch Dichromatic Color Wheel
4-1/4" Dichromatic Filter, on an Aluminum Bracket, with Stepper Motor and Optical Encoder
Very little is known about this unit, unfortunately.
The motor is a 3 phase DC stepper motor, type 402, Nidec p/n 32S8754010
The optical encoder is manufactured by Texas Instruments
Second Image Depicts Back Side of Item