9282 D Street
Dated marks from J. S. Mattos are very rare.
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.
5218 Foothill Boulevard
This clears up the mystery of the incomplete example I documented a while back.