Pulley can be sleeved to fit other shaft sizes.
These type pulleys are used in metal and wood lathes, band saws, wood planers, milling machines, Delta Rockwell Powermatic, Clausing, Oliver, Nova, Bridgeport, etc.
Looks very much like a Lovejoy, but could be reliance, Gerbing, TB Woods, Browning, Lewellen, Maurey, Berges, Carlisle, Comintec, Depak, Lenze.
Check out my other pulleys of the same type, but smaller sizes.