The Metamec clock is a typical design of the 1950s, and several other manufacturers produced similar clocks in this style. This example has a key wound mechanical movement. Later developments included battery powered mechanical movements, followed by ones that could be mains powered. Metamec Ltd Of Dereham, Norfolk remained in business until the late 1970s.The clock has to be wound up every day by means of a key attached to the back of the movement.