Sort of a shock-absorber for bowlers; very cool. Great info and beautiful hat again, Steve.P. & C. Habig Wien - Berlin "Special Qualität" with "Auto Cape" probably mid 1930s. This another unique + special Stiff Felt. The Austrian Patent (133275) stamped on the sweatband is for a felt insert that P. & C. Habig Wien called "Auto Cape". The patent claim is to make a stiff felt hat that is resistant to denting and the felt insert being a part of the invention. The hat was made for the P. & C. Habig Berlin store at Friedrichstrasse 82 which didn't survive WWII.
"Auto Cape" drawing from the French Patent(756192A).
This is the French Patent (756192A) from 1933. The translation might be a bit more clear in this one.
http://germanaustrianhats.invisionz...ch-patent-nr-756192a-1933-m-adolf-sindermann/
The inventor Adolf Sindermann has a good number of hat related patents. His company was a major supplier of felt stumpen and capelines.