This list of button manufacturers and their button back marks might be helpful when dating buttons. It's from an interesting thesis by Sarah Elizabeth Marcel of The University of Tennessee - Knoxville "Buttoning Down the Past: A Look at Buttons as Indicators of Chronology and Material Culture."
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Sylvia Liszka Durell, Author
Owner of HoleyButtons.com and a founding member of the Hernando County Button Collectors Group in Florida.