I hope to find some more definitive information when I get to restoring it. I do know that it's a Canedy-Otto and think it's a No.36. There's a catalog at vintagemachinery.com that has this one it, but mine has babbitt bearings while those may have bushings or ball bearings (bearings are not split like on this one) so I have to assume this one is older. The catalog also shows that these were still for use with a line-shat setup, as they had the idle and drive pulley on them rather than the v-belt drive. I didn't see a date in that catalog, but didn't look too hard either.
BTW, I'm in the process of restoring my lathe... also from the 20's. She's wet with paint as I type.