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This early electrical movement, described as the greatest advance in timekeeping in 450 years, was functionally identical to a traditional mechanical movement, minus the mainspring power source.
214/218s are simple movements, but require special tools and techniques and are intolerant of abuse.
One missing or damaged tooth on an index wheel and you have a watch that won't run (the index wheel is about 2mm in diameter, has 320 teeth, each of which is 10 microns in height and the pitch is 20 microns).
It is usually a wristwatch, worn on the wrist with a strap or bracelet.
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