Notice the side crease on this hat. You will see it on other hats in this issue.
I was watching an early 1930s Warner Bros picture a few months ago, one in which Jimmy Cagney stars as an impresario who has to run the same show over different theatres on the same night in order to land a huge contract. One of the minor characters in this movie wears a fedora that has the front brim down, back brim up, but which has Indy-like dents on both the front half and the back half. When I saw this, I thought it was done for comic effect, but it seems that really was an accepted bashing style back then.
I wonder if that double-bash idea came from the Campaign Hat, which was still being worn by infantry troops and which would have been well familiar to anyone who'd served in the Army? There was something similar in a few Western hats, as well.
I'm looking forward to the PDF of this. Great find!