There are two marriages on www.familysearch.org "International Genealogical Index" - British Isles David MAIR m Helen BLACKHALL 06 Nov 1840. Strathmiglo, Fife. Scotland David MAIR m Helen BLACKHALL 07 Nov 1840. Auchtermuchty, Fife. Scotland There is no indication that these two marriages were not the same couple...They may have declared their vows in each others parish???...I don't know..