Blitz? jack

[Lang]

I am at a property in Queensland clearing out 100 years of stuff for some friends. Found a jack that looks familiar but no camera. If it is military I will keep it. What is it?

Quite large. Has a flat rectangular plate on the bottom about a foot long by 6 inches wide. This is surmounted by a similar shape low "box" about an inch high.

Coming from the centre is a round screw type jacking section. This vertical screw section has a handle cast in at 45 degrees running down to the top of the flat base box.

The winding fitting (where you put the jack handle) has a small "handle" sticking out, I suppose to wind up quickly with your fingers until pressure takes up.