Hydraulic Jack - not currently working (Ilford IG1)

Weber Hyrdaulik 2t. jack. Inherited from a great uncle and hasn't been used in years. As can be seen from pictures it has some rust. The support and the valve move freely but the actual pumping mechanism doesn't currently work. Not sure if it seized or the oil needs topping up but at any rate some maintenance is required.

If interested, please suggest a time when you can collect.