Rare piece of vintage computing history! From the estate of a long-term Honeywell engineer. A Honeywell VACUUM TUBE COMPUTER BOARD. Honeywell D-1000 (Datamatic 1000). "Gone But Not Forgotten Honeywell D1000 - First Generation Computer 1958-1969 B&O Railroad A Remembrance From Field Service Arlington Branch November 14, 1969." Mounted on a wood plaque that's about 17 inches tall and 12 inches wide. Looks like it's mounted with two screws. The first Honeywell D-1000 sold for $1.5 million!