William B. “Bill” Andrade (1924-2016) left marks on sidewalks all over Oakland. His obituary was in yesterday’s paper and a memorial page is up. He founded the Andrade Concrete Company in San Leandro with his father, August Andrade, shortly after World War II.
In Oakland, I’ve documented Andrade marks dated from 1946 to 1961 (missing 1954, 1957 and 1959). Presumably there are more in San Leandro, Castro Valley and Hayward. The mark above is the earliest I’ve found. Many marks from 1961, the latest year I have, are scattered around Jingletown. His work survives all over Oakland, which speaks to his success and to the quality of his work.
He used a distinctive escutcheon for this company, and also for a short-lived collaboration with Arthur Moniz of Oakland (the two examples I’ve found did not have dates).
He is not to be confused with M. Andrade & Son, which was run by Marvin and Mark Andrade of Oakland.
Oakland Underfoot 
27 November 2023 at 4:10 pm
There’s an Andrade mark around 531 or 535 Prince Street between York and Erie in the Grand Lake area that could be 1959. The last numeral of the year sure looks like a 9 and the preceding one looks more like a 5 than a 4. As with many Andrade marks, the date is difficult to read clearly though. I’m sure you’ve seen it but it might be worth another look if you happen to be in that neighborhood.
8 January 2024 at 2:44 pm
I visited this mark, photographed it in very good light and am not prepared to confirm any year. Too bad!