Doesn't look familiar for spreaders in this area, but as good of shape as it appears to be, seems there ought to be a mfg. tag still intact somewhere on it. I'm seeing some cast in part numbers like on the top beater housing, and ratchet gear. Might get an idea by writing those part numbers down, then doing a search on Google, and see if anything comes up. Worth a shot.
I've found out what several pieces I have had in the past, with no markings that were ledgeable. by doing that.