Did some back tracking on your postings and found the info for the 1930 census, no wonder I couldnt find him with listed as Billy.
Found the Death record for Harry Nobles and based on his WWI registration form, its the same one.Born Sept 1894. And with luck, his SS# is listed.
Name:HARRY NOBLES Age:90 Years Death Date:11 July 1985 Place of Death:Jacksonville, Onslow, North Carolina Birth Date:22 September 1894 Gender:Male Race:White Marital Status:Widowed Autopsy:No Hospital:Nursing and Rest Homes Bed Code: Attendant:Physician Burial:Burial in state Father:NOBLES Place of Injury: State of Birth:North Carolina Residence:Wilmington, New Hanover, North Carolina Social Security Number:240 20 9201
If this Harry Nobles md to Ludie is the father of your William Noble/Nobles, I found a Family Tree site that has taken both Harry's father & mother back several genearations. It is a current site so his email address should be good.