3644 Dimond Avenue
This is part of the Renaissance School grounds. Not only does this push Hutchinson Co. back a little earlier, it also tells me that the mark must go back to 1910 at least, because this is clearly a hand-altered 1910 stamp.

2039 12th Avenue
The numerals are Holt’s phone number. The lettering is interesting; I would put this in the early 1920s.

E. 20th Street at 12th Avenue
This confirms that yesterday’s mark is in fact by W. D. Perine. I don’t dare guess the date, which is in the middle of this mark, but marks of this type generally predate 1920.

1029 Arlington Avenue
This is definitely not W. E. Nelson as there is no W. I’m assigning it to 1913 because I can’t see what else it could be.
1633 San Pablo Avenue
This mark is at the door of the cute little Haley Law Office building. It’s a much better example than the other one I found last July.
450 24th Street
Battered but handsome. I’m a sucker for the small caps in the word “and.” Hope I find more from this maker. See my profile here.

Perkins Street at Warwick Avenue
Lincoln Cushing’s site shows clear examples of this mark going back to 1899. Actually my photo is lousy, but the mark itself is no better so it’s a wash.
UPDATE:Apparently this mark has been erased since I recorded it in 2010.