This is a very large DC servo motor.  You can see it in operation here:

http://www.emarket-usa.com/anuncio-13669588-WestAmp-DC-Servo-Amplifier-Large-High-Current--PWM-Arizona-Phoenix.html

Click on the link under the mpg icon at the top of the page.

This servo motor is very powerful and runs with the servo amp shown in the webpage linked above. 

To get an idea of the size of it look at the first picture above.  The ruler next to the motor is 24 inches long!

It has been fully gone through

a - The bearings have been replaced

b-the magnets have been reglued down.

This motor will comfortably move VERY large loads.

In the 3rd photo you can see the pulse indexer. This motor is ready to go into a system. Comes with 2 spare indexers.

specifications in the 4th image