6038 Mauritania Avenue
Avilas may have been an amateur, but who can tell?
6706 Outlook Avenue
F. M. Brown may have been the same guy as Frank M. Brown, but if he was I don’t know why he used two different stamps during the same years. My previous dated examples are all from 1944, but it wasn’t clear until I saw this one that he used an actual stamp instead of (or besides) doing them by hand. Maybe he had a solo practice as well as his contractor’s practice.