Keep looking!

[Northwoods]

Scored a nice, tight, unnumbered 6 1/4" (with a 3/16" tip) screwdriver, marked PLOMB TOOL Co  LOS ANGELES.
AA indicates it is from 1927 or earlier, but this Popular Science ad shows it in the Dec. 1928 issue.  The advertisement, though, could have simply shown a stock illustration from an earlier date.
Either way, I like it.

https://books.google.com/books?id=dicDAAAAMBAJ&pg=PA90#v=onepage&q&f=false