Here are three old postcards from before 1914 that show postage stamps being perforated at the U.S. Bureau of Engraving and Printing (BEP). These all show what are know as rotary wheel/flat plate perforators that were used to perforate U.S. stamps from 1857 until 1956. Do you know of any other such postcards besides these three for perforating postage stamps?
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