Surprise! I felt up to a short walk after all, so here’s a bonus entry. This is on the west side of South Magnolia Avenue between Michigan and Prospect.

There is a date in the lower right corner, but no name anywhere that I can see. Although scofflaws who stamp a name without a date are fairly common, this is the only date without a name I have seen. I know it’s possible for the name to wear away faster than the date, presumably when the mark is made more shallowly for some reason, but if there was ever one here it is completely gone.

Update 12/20/20: I now know that the Board of Water and Light usually stamps “BWL” in the lower left and a date in the lower right. The date style seems to match theirs. So, my guess on further consideration is that this is a BWL stamp and I missed the mark in the shadow. In fact, I have walked this block in daylight and I am pretty sure I remember a BWL stamp in this vicinity, so that is probably what this is. I’ll have to check again sometime.