↑ 1.01.11850 United States Census. (Hand-written transcript for Nancy Barnard (née Gunder)) Ohio, Jefferson Co., Mt. Pleasant p.403/806 Dwelling 316 Family No: 329.
There is a photo of the gravestone, which looks quite new, and has a birth date of Aug 6, 1840. It is possible that the stone was commissioned by descendants who misread his birth date (d/m instead of m/d).