It looks heavy duty, It will never die. What does the name plate say? I bought my sears grinder 40 years ago and I use it alot, ball bearing type also. It will probally outlast me. My neighbor has a simular one like yours, it was a hand me down, still going strong.
Enjoy your new toy,
My neighbor has one labeled Miller Falls that look like yours but Brian is correct. An enlargement of your motor tag (see attachment) seems to confirm what he says. Maybe the Kingston-Conley made them for others as well.