So, here's another Pong-era game to be identified, discovered by the American Classic Arcade Museum (ACAM). Seems to be a 3-in-1 game ("Blitz", "Thumper Bumper", "Tennis").
All that's known so far is that it's a conversion for Chicago Coin's TV Ping Pong. Made by Chicago Coin, not made by Chicago Coin, no one really knows yet.
Paging gregf and "The Golden Age Arcade Historian"...