I was just over at mycomicshop.com looking at a
SUPERMAN ANNUAL issue, and was quite surprised at the value listed on that Alan Moore/Gibbons issue. $70.00 in mint!
And that's an issue that is not hard to find in another format. For an issue published in a relatively recent era, that's pretty high. And ridiculously higher in a CGC graded case.
So I guess that settles that it's a very famous issue. I always thought it was vastly overshadowed by their later WATCHMEN series.
I was wrong.