The design was in the Sears Tele-Games version of Pong in 1975 and Atari Pong Model C-100 in 1976.
The prototype came from the collection of Allan Alcorn, who created Pong, one of the first video arcade games, in the 1970s. The auction included a letter of provenance signed by Alcorn.
"In 1975, Atari had managed to become dominant in the coin-operated entertainment business and moved on to build video games for the home market. We had to get Pong running on a single chip of silicon so a product could be built at a price a consumer could afford," Alcorn wrote.