[Jim in NC]

If you have not done so, look closely for an ID tag or a manufacturer's logo. I cannot identify it. I do not believe it has sealed or ball bearings, but the raised areas on the disc spacers serve as the bearings and have to be greased often. Some older discs had wooden boxings, and they had to be greased too. Wish I could offer more. A guess is that it favors a Ford or Massey Ferguson disc.