I wanted to share this "find" and I hope someone can confirm that this is a Chicago L-8 HS ($25), not an L-4 E (50c) OR more importantly another cheap-o classic precancel that I have missed in the catalog.
The first image lines my stamp up with the L-8, and the second shows it with the L-4 E. If I am reading the Catalog right, the 15c Clay only ever had these two Chicago "classics" on it, and the L-4 has its lines closer together and (paradoxically) has larger print than the L-8 (or mine):
Does anyone know of another cheap-o 15c precancel to burst my bubble?


One last tidbit to share with anyone who is as unfamiliar with the early US precancels as I am ... according to the catalog, both the Columbians (upto about 30c) and the Trans Miss (upto at least 10c) exist with precancels slapped on them. Amazing. Anyone got some for show-n-tell?