I have a 1940's era Osterizer chrome base one speed. Family heirloom only repair was to replace the worn out rubber feet when I happened to be drilling out some rubber padding with a hole saw.
The Champion juicer I think is from the early 60's I have posted picture of it at work several times on permies along with the steam juicer which we have had 5 years but will last another generation.
I also have a grain mill attachment for the Champion that has seen a lot of use and is still going strong.
Now If you find a Champion Juicer motor and no attachments it is still a very valuable motor. A grinding wheel, sanding drum or disk or buffer can be mounted and it will be stronger than most commercial models.
I have to add my broadfork
webpage I had mine made special with tines closer together for digging up Hmalyan blackberry crowns. He says that they are not for digging up large boulders but they have been known to do so without damage. I have doon it quite a few times.