Old vintage citizen clock

Old citizen brand boat clock. It dates from the 60s. It was originally installed in japanese cargo ships. The hundreds of clocks in the ship were controlled by a single clock in the captain's cabin (the master clock). This would allow the clock time to be changed quickly when the ship was crossing a new country with a different time zone. The old clock movement has been replaced by a battery-operated movement.

Ref. : A6UV5HZ8