By process of elimination, I thought it was close to a DC8, but I wasn't absolutely sure. It obviously isn't a 707 tail or even a 747. The 757 and 767 weren't around neither. I never thought it was an Airbus.
There is always a possibilty that the photographer has the year wrong. I thought that may have been the case also. Now, for sure, it's pretty obvious that everything is correct.
Caution wake turbulence, you are following a heavy jet.