Polydron Time Teachers Manual Clock. Enables children to progress from simple to more advanced time concepts. Polydron products are proudly designed in the UK. Polydron operates to ISO 9000-2000 standards and all products are independently tested to the European toy safety standard EN71. Polydron is the winner of the prestigious Dr Toy "Best Classic Toys", a What Toy Award winner, a British Design Council Award winner and a Spiel Gut Award winner. Polydron products are also recommended by the Parents' Choice Foundation.