Assuming the type in question to be a Comet, it would almost certainly be a 4 series model.
Looking at the wingtip, there would be some kind of fence visible from the photos perspective. I also dare say that the profile nose on a Comet is a little less sharp than what is shown on the picture.
But looking at an
1-11 wingtip, it seems that there is quite a bit of similarity. As it has been mentioned, if not established, by people more knowledgeable than me that 1-11s were among the types operated on the discussed route in a matching time frame, IŽd place my bets on this type here.