Modern synchronome master-clock with built-in dial movement and Shortt synchroniser Modern synchronome master-clock
"High Movement" master clock by the Telephone Manufacturing Co. c.1950 "High Movement" master clock 1950
Master clock of the "Silent Electric" type made by the Magneta Time division of the British Vacuum Cleaner and Engineering Co. Ltd. Master clock of the Silent Electric type made by the Magneta Time Division
Electric master clock (no.663, seconds pendulum model), by Robert Mann Lowne, England, 1844-1929 Electric master clock (no.663, seconds pendulum model) 1844-1929