Rock Em Sock Em Robots - Marx -USA

Classic early edition robot boxing game.
Robots are moved about using controller, left and right buttons operate the arm punches.
Opponents try to knock each other's block off with a sharp blow under chin in just the right position.
Head pops up with a "ZZZRRRR" sound and can be pressed back on again.
Note sharp post tops, later versions have 'button-top' flat top posts and name stickers and/or head ratchet sound were omitted. United States