The earliest address I have for him is on his 1919 marriage certificate to Mary McShane
(its actually a 1938 copy, not the original) which shows 48 Kent Street, Belfast.
I mention this because I found an online marriage record of
Edward Gribben Booth to Mary Margaret McShane in 1919.
Ireland, Civil Registration Marriages Index, 1845-1958According to the 1919 marriage index Mary McShane's middle name is Catherine not Margaret
Mary Catherine McShane
Jul-Aug-Sep, 1919Belfast, Ireland Vol 1 Page 661
Edward Gribben Booth
Jul-Aug-Sep, 1919 Belfast, Ireland Vol 1 Page 661
The 1919 m/c (1938 copy) you have who witnessed their marriage?
Were they related to either couple?