Someone is selling all three known World of Synnibarr tomes on the eBay. That's the '91 edition of the rules (the one with the angel chick and the dead lion men on the cover), the fairly well known 1993 edition, and the only known supplement, the Ultimate Adventurer's Guide. I've long wanted to see the insides of the 1991 edition. My gut tells me chargen would be simpler. Two of the three character generation options in the 2nd edition look like later additions to me.
I suspect that there might be earlier editions of Synnibarr, done in very small print runs. But at this point I don't have any hard evidence, other than the fact that in the copy I own McCracken copyrights his book "1980, 1985, 1987, 1989, 1991, 1993". I need to go through the Dragon's classifieds and see when the Synnibarr ads first appear.
[Map] Old Mars, campaign area in color...
1 hour ago