The 2-Player version of this game is Williams' 1976 'Space Odyssey'. Some of the games pictured in this listing have blue pop bumper caps while others have white ones. We don't know the reason for this difference. The 2-player 'Space Odyssey' seems to always have yellow pop bumper caps. Steve Kordek told us that the backglass art was derived from a picture he obtained from NASA. The picture surely was of the painting made by noted space artist Robert McCall (1919-2010) which can be seen here. Tom Cahill, former Service Manager for Williams, told us that approximately 200 Space Mission games were made with steel cabinets. If anyone has access to a steel cabinet version of this game to make photographs, please contact us. Production Run Records for Space Mission: 11652 total Sample run: 206 Production Start Date: Prior to Jan-5-1976 / Production End Date: Prior to Jan-5-1976 First ship date: Prior to Jan-5-1976 / Last ship date: Unknown, remaining 1 shipped out with production games. Production Run: 11446 Production Start Date: Jan-20-1976 / Production End Date: May-28-1976 First ship date: Jan-20-1976 / Last ship date: Jun-8-1976 Product History Record for Space Mission: Quantity produced for USA/Canada: 5621* Quantity produced for export: 6031* Total quantity produced: 11652* BOM: $355.99 Price to Distributor: $861.50 *These quantities may be sales estimates.