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Dating seiko watches
Watches progressed in the 17th century from spring-powered clocks, which appeared as early as the 14th century.During most of its history the watch was a mechanical device, driven by clockwork, powered by winding a mainspring, and keeping time with an oscillating balance wheel.Early models were essentially standard pocket-watches fitted to a leather strap but, by the early 20th century, manufacturers began producing purpose-built wristwatches.
A pocket watch is designed for a person to carry in a pocket.
Today most watches that are inexpensive and medium-priced, used mainly for timekeeping, have quartz movements.
Expensive collectible watches, valued more for their elaborate craftsmanship, aesthetic appeal and glamorous design than for simple timekeeping, often have traditional mechanical movements, even though they are less accurate and more expensive than electronic ones.
In the 1960s the electronic quartz watch was invented, which was powered by a battery and kept time with a vibrating quartz crystal.
By the 1980s the quartz watch had taken over most of the market from the mechanical watch.