I had an exciting find tonight: another stamp from the aughts. I’m not sure how I haven’t noticed it before, since it’s quite a clear one and I often walk this street; I can only guess that it means I usually walk on the other side. It is on the north side of Prospect Street between Jones and Holmes (just east of Jones).

Trying to find out anything at all about the J.F. Sowa responsible for this stamp has been foiled by the fact that a person with the same leading initials and last name is an important personage in computer science. If I try for “J.F. Sowa” and “Lansing,” I get a lot of articles that include citations to Sowa alongside citations to other authors who happened to publish with Michigan State University Press. Adding “concrete” or “cement” to the name does not help, for reasons I will leave as an exercise to the reader. If I exclude the word “conceptual” in order to filter out results that refer to Sowa’s most cited book, Conceptual Structures, it does cut the results down to a handful, but none of what’s left is useful.

The slab is in rough shape, covered in spidery cracks. Still, it’s impressive for it to have survived 112 years, and I think it is in the best condition of the pre-1910 stamps I have found. It looks to have received a neat patch at some point, which appeals to the part of me that enjoys darning socks.

Update 10/25/21: I learned a bit about J.F. Sowa with help from my mom, and wrote an update.