any idea what this 10 tone jack is?

[SatisTraction]

the owner doesn't know much about it. thinks it is 10 ton and it does not work. what is it and what's it worth?

 

[CRTDI]

This jack has been for sale a loooong time. It's a Weaver. $50.00 to $100.00 bucks in its current state.

Very expensive new:

http://www.castleequipment.com/Jacks/service_jacks_by_weaver.htm