Here are a few contributions to the typosphere's exploration of dealers' labels and decals:
This one is self-explanatory.
This is from my 1929 Underwood portable with Ukrainian keyboard.
And this one is from my 1922 folding Corona -- the first typewriter I bought as a "real" collector, in spring of 1994, when I was on fire with typewriter desire after reading Paul Lippman's American Typewriters: A Collector's Encyclopedia. Amazingly enough, International Typewriter Exchange is still in business.