I think it does have drive. I see a control rod running along the handle, to another rod going to an arm in front of the motor. I see a few links of chain behind the cobwebs. I wonder if it has a single control for drive and to engage the impeller. The chain might be there as a reduction gear. You certainly would not run the impeller at motor rpm. I'm heading that way in a couple weeks. Should I bother the seller just to get more photos or a video of it in action when I have no intent to add it to my already over filled garage?
I have a 1963 Montgomery Wards PowrKraft snowblower with zero safety controls. The drive and impeller are set by levers with no springs or dead man controls. It's the only snowblower I've owned where I've seen the impeller turn. And no, I won't let the wife run the newer model. I've seen too many videos of women crashing motorised toys because they don't understand the words "Let go". These predate the onset of OSHA (1970 by Nixon) and CPSC (1972 Nixon). Stuff like this probably inspired the creation of OSHA and CPSC.