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 William Doty (15 December 1842 - 1 December 1930), BillionGraves Record Mount Muncie Cemetery, Leavenworth, Leavenworth, Kansas, United States, North America