2037 106th Avenue
A very fine example of the Wentworth mark, much better than my other one.

3433 Oak Knoll Boulevard
I just discovered that this is a duplicate; sorry. It’s the latest date I have for Duffin so far. Apparently the Duffin & Riding partnership lasted from the late 1920s to 1941, after which the two names appear separately. The only thing wrong with that supposition is that my earliest Geo. Riding mark is from 1940. Perhaps one of the original pair died and a son carried on.

2545 19th Avenue

980 107th Avenue
Finally, I’ve found an L. B. Duffin mark with a date.

1820 9th Avenue
This hand-drawn mark reads, “J&J General Contrs” with the contractor license number beneath the right side, two phone numbers beneath that, and the date at the bottom.

1709 35th Avenue
C. A. Heldt is a new maker for me.