One more thing regarding the maker's mark. This stamp is stock one sold by Tandy.
The images represent a "side" which is one half of a an animal skin. A "mallet" which is a speciallized hammer made out of rawhide or more recently out of phenolic and a "swivel knife" which is the type of knife most favored by leather workers to make the decorative cuts.
Many leather workers have used this stamp. It looks as though Nora Van Horn either carved her intitials in or had a secondary stamp to put them inside the stock one.
Awesome information John, as usual. That looks to me like one of her cases, no question. Maybe the first pool cue case that started it all?
Chris