305 N. Harbor Boulevard
Right near the San Pedro cruise-ship berths, way down at the edge of this huge city, I found proof of concept that L.A. has sidewalk stamps.
1109 Pacific Highway, San Diego
I was only in town for a few hours and didn’t get far from the cruise ship, but here was a stamp from Diversified Minerals Inc. (DMI) right by the pier. I’ve been to San Diego before and knew there’s a wealth of stamps there, some of them quite old and preserved by city ordinance. But this was the one my camera caught.
2226 Tenth Street, Berkeley
Finally I have a decent example from this year, though it’s not in Oakland.