Is there a listing of the measurements of early US Stamp issues? I have 3 stamps that appear to be Scott #1, 1847, Ben Franklin. 1 appears to be a little different in size. If I knew what the issue measurements (MM x MM) I could tell if one was a copy and not an original. Similarly for the 1893 Columbian Commemoratives. Perhaps I need a specifications listing or handbook that discusses the design and history of early US Stamps.
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