Looking at adding to the System 1 collection...
I know about the one on ebay for $5k(or so) - its been on there for like 2 years..
Roller Disco / IPD No. 2005 / February, 1980 / 4 Players
MPU: Gottlieb System 1
Type: Solid State Electronic (SS) [?]
Production: 2,400 units (confirmed)