Can you provide a link?It's a Mott/Alamo. According to archived pics of this model, the pulleys were open and did not have a cover. There is no rear roler only a cutting rotor and yes the rotor turns very easily by hand. Thank you for providing the link.
ps. No it is not bent...just an illusion.

Agreed. The closest I found online was this one (which doesn't list who makes it): Fair Share Farm News: Spring is Almost HereCan you provide a link?
The gear box is mounted backwards from the Mott that I had, and every Mott picture that I have seen.
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I recently purchased a flail mower. It has no distinguishing marks or labels. The mower is painted John Deere, but I doubt it is the brand. I am looking for the 2 tire/wheel assemblies for it. I seen a post on here that shows an ALAMO that is very similar. (First Picture).
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FWIW, my 74" Ford 917H was purchased at a farm auction as well. $150, and it had both a rear roller and a belt guard. You're going to be unpleasantly surprised what a (new) replacement rear roller, bearings, and bearing cover/brackets are going to cost. It will make the cost of a belt cover and fasteners look like chump change. Whoever pocketed your $400 went home with a big smile on his face.
//greg//