That's the second O&R pump Cnew has that's missing the pump section, I don't think mine has an intact impeller either, being made of rubber they dry out & crack up with age, as well as fail if run dry. I do have at least one pump with a good impeller here somewhere.
The handle is attached on the other side of mine, it's also one of the few older engines I have with the Model letter printed on the decal, I had to fit a new set of feet as the originals were falling apart;
David