1357 63rd Avenue
I’ve surveyed the whole area around Abreu’s address and didn’t see his mark there. Always fun to find a new name in the Oakland sidewalk scene.
3688 Lily Street
A mark like this demands a Talmudic attention to font design. Is the obstructed first letter an E or an F? I was ready to guess F, but the 1911 Husted’s Directory for Oakland, Alameda and Berkeley has a listing for Eric M. Hylt, laborer, residing at 25 Franklin Avenue, which later became 39th Avenue. The 1922 directory lists him at 3732 39th Avenue, presumably the same house. The 1909 directory lists him as “cementwkr.” He wasn’t in the 1907 or 1910 directory.
This is his only surviving mark in Oakland.