This is a Meade #532 battery operated motor that was designed for the older Meade Polaris/Saturn line of equatorial mounts (generation of the 285/395/4500 scopes). Retail at Apogee is about $100.
Included is the motor box, gear w/ screw for the RA control, and a hand knob for securing the box to the mount. No instructions (but obvious if you have ever attached a drive before), but otherwise brand new in original box. It has never been attached to a mount.
I don't know what other mounts it fits. But since I'm only asking $30 + $3 postage, you can buy it to experiment with!