SN9588 has an unusual paint job done to it, almost looks like Batman.
UPDATE: this unit just sold on eBay as of Feb 28, 2013 for $1691.66. Here is the eBay auction detail:
All Original Yellow (rarest color) Computer Space arcade game....with some custom black paint. This is one of the coolest cabinets of any coin operated game. This Yellow Computer Space s/n #9588 is in wonderful condition. There are some scratches in the black paint but the fiberglass looks great. This machine is being sold as-is (non-working). The game powers up with sound, but video is intermittent.
Click on the image of the cabinet to open a larger version (new pictures from eBay auction added below).