A different date of birth (Feb 25, 1821) is listed for John Zehr in "Genealogies of Three Large Families of Lewis County, New York: The Farney Family 1795-1988; The Rev. Rudolph Virkler Family 1792-1988; The Zehr Family 1789-1988 1989" (third update, Two Volumes, 1997 pages). The same date is listed in the 1933 and 1969 editions of the same, with no correction made over that time. Does anyone have a primary source?
A notice in the Lowville Journal and Repblican listed his death as 86. This would put his birth in 1820 rather than 1821 (although it is just a newspaper article):
LOWVILLE JOURNAL AND REPUBLICAN, THURSDAY, MAY 3, 1906
John Zehr died Wednesday, May 2d, aged 86 years. He is survived by one son, Christopher Zehr, of Albany, and by three daughters, Mrs. William Matteson and Mrs. William Manning, of Croghan, and Miss Lena Zehr, of Syracuse.