I found another DPS stamp. Like the others, it’s from the 1950s. It’s on the east side of Lathrop Street between Prospect and Eureka.

It snowed today, so this is the best I could do. At least the S is very prominent!
The stamp is on the next one past the stamp with the ridges. I included the fire hydrant for context, and some late holiday lights in the upper left corner as a bonus. I went this way specifically because I knew there were still some lights on this street.