Is that mark on the hub a partially struck "0"? Or is it just a scratch? That hub does look to be from right before or right after WWII to me. The brake lever and front brake look to be the unusual and desirable Schwinn/Webb types from shortly before WWII. It looks to have a the short "19 inch" frame, which is a little small for most adult men to ride. These are well-made bikes.
I agree - it looks like a "0" or I suppose a "9" is possible too, given what's there. It looks like an intentional, but partial strike rather than a scratch. I would say you have a 1939 or 40 hub from before production converted more fully to war materials.