After a short hiatus I'm back with an update. A few weeks back I managed to snag a revision A (1.1) of WWF No Mercy off ebay for $10, so what you might ask? it's not like any of the N64 wrestling games are rare.
Well you may be right about that, but the WWF No Mercy launch was haunted by a nasty save glitch which would erase lots of stuff and Revision A was most likely only available to those who contacted THQ....
Well read more here and feel free to comment if you have aditional info.