Another old transmission jack question

[JABgj]

A friend has this old trans jack in his shop and she's a leaker. Any suggestions on who made this one (no tags or labels)? It seems it spent some time in a local school shop, is pretty heavy duty and for age, some of the pedals and fittings are cast iron. Any info would be appreciated.

 

[txvwnut]

Looks a lot like a Blackhawk.

 

[JABgj]

Thanks for the reply, I will have a look.