another old blackhawk jack...year?

[Greg5OH]

Was advertised as 10 tons for 100$, I immediately drove over as I wanted a 10 ton for my class A diesel RV, and rather not use bottle jacks.
Well turns out its rated at 6000 lbs...still bought it, heaviest built 6000 lb jack I have ever seen..huge piston etc.

Any idea on year?
Im still going to try lifting the corner of my motorhome tonight...Id trust this 3 ton over any of the modern 3tons I have..

 

[Jazz1]

What's the model # on the hydraulic jack plate? Looks similar to my S14. I have just ordered a rebuild kit for mine. Seller told me the jack worked fine but leaked so he drained it, and finally sold.
Wife just asked me how high the S14 lifts. Anyone??