The U.S. Post Office Departments had a prominent presence at many of these expos. They set up a model post office at the Philly expo where visitors could mail cards and letters with the special expo cancel. Additionally, the POD issued a commemorative postal stationary envelope (U522 July 27, 1926) at the expo. Below is a first day with the model PO cancel
Nice work Russ, I'll have to dig out, both the stamp and the cut square I think I have them and include on the page. I need to cut down on the information, I felt there was too much writing.
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