The Rowe / AMI Remote Volume Control parts seen in these photos are used with the
MM2, MM3, MM4, MM5, MM6, TI1, TI2 and later stereo models.
Please see attached scans for more information.

The AMI part number for the potentiometer in this Remote Volume Control is H-6285.

This used remote volume control is clean and appears to be OK but has not been tested.
There may be marks and or scratches on the plastic body but it is not cracked or broken.
It needs to be assembled, and no cable is included.