Dunno about that, but check the date stamps on the ICs on the MoBo to get some clue to the date of production, but nailing it down to the pre-production range would require a particularly good stroke of luck, having much to do with the month of the release date.

Click to expand...

VSLI chips labeled '87 or '88, most are '88. Power Manager is '89. Sound is '85. The High and Low ROMS are stamped '83-'89 in green with a long number opposite. So from that it still looks like an off the line machine, unless the mono was replaced. I would really like to see another demo unit board to compare.

At the very least I have a unique label! LOL