Floor jack from the '20's

My father is trying to find information on this floor jack from the 1920's. What's interesting is it has a chain mechanism which I haven't seen elsewhere. Please help! Thank you!

 

No info but that thing is bad ***.... Hell ya

 

Join Garagejournal.com,,, those guys know tools.

 

Still looks like it's in good shape. Clean it up, lube it and try it out!

 

That's pretty cool. Looks like its in good shape too

 

Is that mechanical rather than hydraulic?
How does it work?

 

Glad somebody had the foresight to not junk that jack. Use it but don’t trust it, it’s older than you or me combined.