Seiko placed an order in 1959, with Epson to start developing a quartz watch. At that time, the project was codenamed 59A. Seiko had a working prototype of portable quartz by the 1964 Tokyo summer Olympics. It was used as the time measurement through the event.
Seiko 35 SQ Astron, was the first quartz watch to enter production, which on 25 December 1969 hit the shelves. Such watches were the world’s most accurate wristwatch to date.
The technology used in watches, having been developed from Japanese. Thus American and Swiss, nobody could patent the quartz wristwatch’s movement.
In 1969, the introduction of the quartz watch was really proved a revolutionary improvement in watch technology.
In place of the balance wheel, it used a quartz crystal resonator and this resonator vibrated at 8,192 Hz, driven by a battery-powered oscillator circuit. It used digital counters instead of wheel train.
The higher Q factor along with the coefficient along with quartz’s low temperature resulted in better accuracy than the best mechanical watches.
In 1970, the first digital electronic watch with an LED display was developed by Pulsar. The first wristwatch to hold Marine chronometer certification was introduced in 1974. Such the wrist watches were accurate to 12 seconds per year.
Junghans offered the first radio-controlled wristwatch in 1990, which is known as MEGA 1. In these types of watches, the oscillator is set to the correct time on a daily bases by coded radio time signals such as JJY, MSF, RBU, DCF77, and WWVB are by the radio receiver in the watch.
This allows the watch to have the same accuracy as the atomic clock and this is also long-term accuracy. The latest models of such watches are capable of receiving synchronization signals from different time stations worldwide.