Dimensions:            Outside diameter  1.8504" (47.000 mm)

(from NTN)              Inside diameter     0.7874" (20.000 mm)

                               Width total             0.6250" (15.875 mm)

Listed to fit some 1947-1950 and 1960 GMC medium duty trucks where it is used as a fan belt idler pulley bearing.  

It is also listed in a 1974 Delco-NDH numerical listing as an Oldsmobile fan bearing, but no year(s) indicated.

Possibly also used as alternator, generator, differential pinion or transmission bearing.  Verify suitable for intended application as returns are not accepted.