523 29th Street
There are several of these along this stretch of sidewalk, all with ambiguous dates. I interpret this as 1959 and the heck with it.

6 Wildwood Avenue, Piedmont
There aren’t a lot of Larry Frye marks out there, so I was happy to find a new date for him.
2915 Madera Avenue
1959 was the last year in which Valenzuela left his marks doubled-up like this; also the last year he used his nice metal numerals to make the dates (like this one from June). This appears to show that he had given those up by early October.

Beaumont Avenue at Allman Street
This is actually a gutter mark. It’s the first Gallagher & Burk mark I’ve found from the 1950s.