Bayko was a British building model construction toy invented by Charles Plimpton, an early plastics engineer and entrepreneur in Liverpool. First marketed in Britain it was soon exported throughout the British Commonwealth and became a worldwide brand between 1934 and 1967. The name derived from Bakelite, one of the world's first commercial plastics that was originally used to manufacture many of the parts. Bayko was one of the world's earliest plastic toys to be marketed.