Here is another link from the Fleer Sticker Project - this one specifically about the 1978 set. I believe the Troy that is mentioned in the article posts on Net54 from time to time - the ad that Troy shared confirmed what I had heard anecdotally from others regarding the Good Humor man distribution.
http://fleersticker.blogspot.com/201...s-mystery.html
I enjoyed these cards when they were originally issued when I was a kid, and I was flipping through a stack of them about 20 years ago at a card show looking to upgrade a few commons, I think, when all of a sudden the Clemente showed up in the stack. I was really stunned - I knew the set was issued in 1971. How could this card be? Then I saw a few cards in the stack for the years after that. Trying to piece together the history (pre-internet for a while!) has made the Clemente card one of my personal favorites. I am always on the lookout for cards from the 1978 set, and I would estimate that they show up about once or twice a year, out of the hundreds of eBay listings for Fleer WS cards. They are tough!
Just fyi on the B&W prototypes that are up on the Bay right now - I think prototype is a misnomer, as Bob made these to sell as sets in both 1967 and in 1974. The "only 300 sets produced" is not really correct, either. He did only make about 300 of the 1967 set, but the second printing, in 1974 was probably done in the 1000-2000 set range. I am guessing the singles that are for sale are from the 1974 issue, but couldn't verify that unless he showed pictures of the backs.
I did try to contact Mike Austin, from the article that was posted, but I don't believe I ever got a response. The quest for a 1978 pack or wrapper (or a picture of either) continues!