For everybody's information:
I found this photo and scanned it properly. It is from the early 70's, about 1974 I think.
The photo is faded, probably from a light leak or lens flare. I doubt if it was a film processing fault. If a light leak, it was probably inadvertent camera opening and there were probably other photos on that roll with the same problem, but we will never know.
There have been some great corrections on this thread, and a lot of new information for me, for which I am, grateful.
Reg, aka GanGuy (Gan is short for Gananoque, Ontario, Canada. eh?)