I have 2 marriage certs, but to be honest, even though I can't make out half of the writing on them it almost seems as if they are for the same couple...
Cert 1 is for the marriage of Robert Cook to Mary Marsh (according to SP, I think it says Marshall), taking place in Tillicoultry on the 20th of the month.
Cert 2 is for the marriage of Robert Cook to Mary Marshall, taking place in Alva on the 1st of the month (witnesses listed, but I can't make out names).
From what I can make out on them, it seems like they got married in Alva, and then went on to Tillicoultry where the minister there entered it into the church records again... only that doesn't make a whole lot of sense...