Possibly the earliest electric puzzle with which the puzzler plays Noughts & Crosses against the machine.
It dates from the late 1940s to early 1950s and was made by Nombrex of Burnham-on-Sea.
Nombrex manufactured electronics equipment such as Oscilloscopes and Signal Generators. They specialised in combining electronics and plastics technologies. In the 1960s they made bumper (fender) parts for Ford automobiles.
We do not know if they made any other toys or games. Do you?