Dating Real Photo Postcards (RPPCs)

Private Mailing Cards could still be used after Undivided Back Postcards were approved, and both could still be used after Divided Back Postcards were approved. For additional information on dating Real Photo Postcards from their backs (address sides), please see:

Robert Bogdan and Todd Wieseloh, Real Photo Postcard Guide, Syracuse NY, 2006, Appendix 2

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How to Identify and Date Real Photo Vintage Postcards: https://www.playle.com/realphoto/