This Department of Public Works stamp is on the north side of Hickory Street between Jones and Holmes. I’ll always collect a diagonal DPW stamp; they seem almost always to be from 1921. This one has a further quirk in that the year has been stamped upside-down at a rather haphazard angle.

I suspect this one is actually a pair to another diagonal one a couple of lots east on Hickory, close to the corner of Holmes.