Here are a few add-ons for some previous posts on Oakland Underfoot.
I found a second variation of the utility-hole covers used by The Pacific Telephone and Telegraph Company, predecessor of Pacific Bell, featured in my post of June 17. I’m quite taken with it.
I found another concrete master number used by a member of OPCFIA local 594. As of now that makes 16 different numbers, but I’m sure there are a few more out there. Previous posts are here and here and here.
Finally, I located a fourth sidewalk maker who was a member of the Cement Contractors Association of Alameda County. The other three are here.
My impression is that like the others, this mark dates from the late 1920s.
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