A few Oakland sidewalk marks include the distinctive oval stamp of the Cement Contractors Association of Alameda County. During my inventory I captured a few of them. I’m positive there are others, but I wasn’t documenting them. I’ll add more as I find them.
It’s possibly coincidental that both of the dated marks are from 1927. On the other hand, the late 1920s were the high-water mark in sidewalk contracting — I counted about 110 different workers and companies active in Oakland at that time. So that would have been the best time to establish the Cement Contractors Association of Alameda County.
I think that Herman Orth tailored his odd-shaped stamp to fit the association oval. I have examples from 1925, his earliest year, as well as 1926 and 1936. For all I know, he founded the association.








21 November 2023 at 12:55 pm
I photographed a 1926 Schnoor Bros. stamp with this mark just below it in West Berkeley. Unfortunately I don’t know quite where I saw it, but I’ll bet there are some in Oakland as well.
15 March 2025 at 7:01 pm
Added an example from N. J. Lindstrom.