a handful of old doorknobs

Gotta admit in honesty, I don't really know how/from where I ended up with most of these -- but here they are, anyways...? <lolol>

One brown colored ceramic/porcelain example with (rusty) iron back fitting, two (loose, but matching) clear glass ones w/brass fittings, and a total of 5 (.25) slightly larger clear glass w/nickel (?) plated fittings, those also with a couple kinds of matching steel/iron hardware.

The plain (well, actually slightly 'speckled'?) brown one is about 2-1/4" across, it might to could be the oldest of the bunch but I don't know that for sure either. The pair of glass ones w/brass backs are a little under 2" across, slightly smaller than the rest of the glass ones which are a little over 2" across -- though all of the glass ones seem to be made of a generally matching shape/pattern to both their glass and metal parts. [no mfr's markings on any...?]

Of the larger glass ones a pair are attached to a typical steel shaft in a set, another one plus the broken-off (.25) remains of its former mate make up another set. The remaining two are singly attached to shafts with small plain iron 'wingnut' kinda knobs on their other ends, suggesting they might have been originally fitted to 'one sided' doors. (closets, adjoining hotel rooms, or something unusual like that?)