Static Cling
Never has been a main focus, but over the years if you collect all 20th century Pre-WW2 like I do, the things just kind of end up sticking to the collection as if they were statically charged.
I can't imagine why any collector would not have a few, or at least an example in their little cardboard piles...they are about as recognizable and historically relevant an issue we have to collect.
Brian
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