The date on the headstone is his birth date. Notice that the death date is left blank. His wives pre-deceased him, and there was probably no one to have his date carved.
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BillionGraves.com record for Ida Doty (17 July 1866 - 12 November 1922), BillionGraves Record Mount Muncie Cemetery, Leavenworth, Leavenworth, Kansas, United States, North America