The best info I can find was that this hack, known originally as "Super Mario Bros. +3" (The +3 denotes that it had a trainer which gave you 3 cheats: Unlimited Time, Unlimited Lives, and What Level you wanted to start on.) was made by a C=64 Scene Group known as ABYSS, who were only on the scene from 1987 - 1988, and SMB+3 was believed to be their first project, although there is no indicator of year or date made in any of the files or the program itself.
So, I would say, that this is a very strong possibility, Syd.
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