I can see from death index that whoever registered his death in Rochdale in 1984, gave his birth date as 11/5/1919.
As with any registration, the info provided is only as good as the knowledge of the person providing it. What they believed to be correct, may or may not have been.
You said he had been placed in an orphanage. Do you know if he lived out his childhood there, or if he was possibly adopted and had a name change?