This pong is one of the many Binatone systems. It is the first of the "TV Master" serie and offers 4 pong games (squash, squash practise, football, tennis).
In order to understand how this system fits into the Binatone pong range, here is simplified list of the systems :
TV Master MK IV
TV Master 4 plus 2
TV Master MK 6
TV Master MK 8
TV Master MK 10
Colour TV Game
Colour TV Game 4 plus 2
Colour TV Game MK 6
Colour TV Game MK 10
The TV master serie are black & white pongs (first generation). The TV Master MK IV system is the same as the Colour TV Game except that the games are in black & white, while the Colour TV game displays colour games.
So how to differentiate a Colour TV Game from a TV Master MK IV ? Well first, the name... ;-) The underside and switches of the former are grey while those of the TV Master are orange. The Colour TV Game has also a small 'colour' logo next to its name (upper right).
The paddles are rather small, with one knob each, but are detachable and connected to the system through two small sockets. One interesting feature is that there is a switch to turn sound on / off (great !).
TV Master MK IV (model n° 01 / 4974)
BUILT IN GAMES
4 games : squash, squash practice, football, tennis
Two detachable paddles with knob
General Instruments AY-3-8500 ?
Start, Manual serve
Game selection and player options (power, speed, bat size, angle, serve, sound)