Just a WAG, maybe George's son? Looking closer at these I see one common piece and that is he worked for Lehigh Valley Railroad. I did find 'G. A. Gamble' on a Lehigh Valley Railroad
Veteran Employees Association Membership List, 1934. Looks like Lehigh Valley went to Buffalo and one of the cards shows he's a member of 'The Park Club of Buffalo', so I'm guessing he lived in Buffalo in this time period.