I was walking on the west side of South Francis Avenue between Marcus and Elizabeth when I spotted a Concrete by Thompson stamp with a reversed date. At first I thought it was one I have featured before, but then I realized I was not on the same street. No, evidently Concrete by Thompson managed to reverse their date stamp at least twice in 2004.

I wonder if these two reversed Thompson stamps were done on the same day. They were done the same year, a few blocks apart in Urbandale, so I can imagine they might have been done one after the other, accounting (somewhat) for the same stamping error.