So it COULD be pre-rev E even in 82, depends I guess when the masks were made. Given the 6011? number on the chip matches the older game its possible this could be a fairly old 'alternate rules pinball mask' which was ramped up later.
Worth a try to dump it electrically, probably.
LN
"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
