R Bailey and T Johnstone formed a company in 1936 called Synchro Time Systems Ltd which dealt with commercial timekeeping equipment.
They became associated with Smiths in 1938 but still used their own name.
In 1939 the name was changed to English Clock Systems Ltd, Industrial Branch of Smiths English Clocks Ltd.
They produced the ECS master clocks. There were three series and manufacture continued until 1963 or later.
In 1962 they collaborated with a competitor, Gents, to produce a clock called by them the ECS Memory Master. Gents marketed the same clock as the Chronopher.