Help identifying a jack

[barnumflight]

I think the jack is a blackhawk maybe 10 ton. Picked it up at an estate sale for 25 bucks. Needs a rebuild kit but I think I did ok.

 

[Hiball]

I believe its a SJ4 based off the sizing, which would be a 4 ton model.

 

[rcjoy]

It might be an SJ-3 2-ton model. You can get a rebuild kit at http://www.blackhawkparts.com.