Don't know much about Canada coins but I think this is out of the ordinary. There is an extra "lens" in front of the eye and the dots/spots in the ear and behind the eye are raised just like the one in the corner of the mouth (which shows best in the images). The back of the neck appears to be doubled but the spread is so wide that one would expect doubling of other areas as well if it were a DDO. Could not locate an other '79 in my immediate reach to see if this is "normal" for the date and the images on line are not clear enough to tell. I know there are internet sleuths on this site who can do better. Any help is appreciated.