Jonathan Buttrick of Carlisle & Mary Brown of Concord wore Married by the Rev'd mr Bliss July : 14 : 1756 [sic].
First recorded birth of a child is Source:Concord, Middlesex, Massachusetts, United States. Births, Marriages, and Deaths, 1635-1850, p. 200: "Eunice Buttrick ye Davghter of Jonathan Buttrick & Mary his wife was born Nov'ber 10 : 1757". This does not help determine which marriage record is correct.
Buttrick, Jonathan and Mary Brown of Concord, at Concord, July 14, 1755 [sic].