Judging by the body panels, it's got to be a '65. They starting looking more like Ford Fairlane muscle cars in '66. I can only remember seeing 5 other Comets in real life aside from the one in my possession. 1 '61, 2 '63s, 1 '64, and 1 '65. Mercury Comets are pretty hard cars to come across these days.
Gorgeous car, lovely photo. A neighbour of mine has one of these that he's restoring so I'm going to show this to him so he has some inspiration to keep him sane!
Love it. Added to favourites.