I am still looking at this thing, What was that cast iron drop down door for? I have read the patent for this at length. The drawing is difficult to get through, but it seems there are a bunch of valves, it seems as though the pneumatic version has a large air operated piston that assists in operating the gas pumping pistons? Are these more or less rare than others and are they more or less collectable? As this one is a rattle can paint job, would you try to remove that and find out what if any original paint is under? What would this thing be worth with all the guts intact, (non-working, no handle, though it may not have shipped with one)?
Thanks.
