Where did you find one with good toons on it still!? Wow, that's in really good shape compared to most of the survivors someone must have kept that inside out of the sun for a good long time.
I have a folder full of information on those in a file cabinet at the shop, repaired some of those tubes years ago I'll look for that tomorrow but I recall those used a standard ski pump / coupled to the 657 for the XP~SP etc. I wanted one for years and never came across one.