A few Oakland sidewalk marks include the distinctive oval stamp of the Cement Contractors Association of Alameda County. During my inventory I captured three of them. I’m positive there are others, but I wasn’t documenting them.
It’s possibly coincidental that both 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.
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