Reliance Motor 1/2 HP 3 Phase 1725 RPM  230/460 V the shaft is 5/8" Dia. Frame is FB56 probable a C after that but the ID tag is damaged.

I test ran this motor and let it run for a 1 hour and it ran well
 

Used motor from a paper company that closed and had spare motors in stock for their equipment has shelf wear and scratches and dust from being stored without its box

 

[Please Look at all the pictures they are part of the description]

                                                                                                          [B1-F1-R2-S3-3]