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How Old Is My Postcard? Part 3 - By: Richard Moody, 2008-07-18 The third era I will discuss is called the "Undivided Back Era 1901-1907" but just keep in mind that the two previous eras I discussed also were undivided back eras. On 24 December 1901, the United States Congress granted permission to use "Post Card" on the back of privately printed issues and allowed the regular size postcard of today but still limited the back of the postcard to just the addres COMMENTS Add a comment |