As a general rule, a higher number of jewels suggests a more prestigious movement.
Diamonds, sapphires, rubies and garnets are the preferred materials. Watchmakers use jewel bearings to reduce friction and help the delicate parts of the movement work smoothly and with great precision. Jewels: Within a movement, metal on metal contact creates wear and tear. Ionic Plating: Process that produces a hardened surface that is durable and scratch-resistant Has a black flat "stealth" finish. Guilloche: Style of engraving that features wavy or straight lines, giving a unique effect when the timepiece is moved or shifted. In this regard, GMT is thought of as "the world's time" and was once the basis with which every other zone set time. Greenwich Mean Time is the average time that Earth takes to rotate from noon to noon. It is the place from where all time zones are measured. Greenwich Mean Time (GMT): Also referred to as Greenwich Meridian Time, the Greenwich Meridian Line is located at the Royal Observatory in Greenwich, England.
#THOMAS EARNSHAW AUTOMATIC WATCH WINDER MANUAL#
COSC is a prestigious Swiss government agency that certifies the accuracy and precision of timepieces in Switzerland.Ĭrown: Part that allows you to manipulate the watch movement for a variety of purposes such as setting the hands, changing the date, winding the mainspring, etc.Ĭrystal: Transparent cover on a watch face that gives view of the dial.ĭeployant: Type of clasp that keeps the closing mechanism hidden, creating an uninterrupted look for your bracelet or strap.Įxhibition Case Back: Unique complication wherein a crystal window is implemented into the back of a watch case, allowing view of the timepiece's movement.įunction Pushers: Manual controls on a case for when a movement features complications that require increased manipulation. To become a chronometer, timepieces have to pass a test conducted by the Controle Officiel Suisse des Chronometers (COSC), roughly translating to Official Swiss Chronometer Testing Institute.
The crown controls the analog watch while function pushers allow you to start, stop and reset the chronograph subdials.Ĭhronometer: High-precision timepiece that has been tested and is certified to meet precision standards Chronometer watches often come with certificates indicating their certified status.Ĭomplication: Any feature added to the timepiece that does not indicate hours, minutes or seconds.ĬOSC Certified Chronometer: Refers to timepieces that have been christened with the title of chronometer. ATM: Measures water resistance Stands for "atmospheres" or the amount of pressure a watch can withstand before leaking One atmosphere is equal to 10 meters of water pressure.īezel: Retaining ring topping the case and securing the crystal Sometimes incorporates unidirectional or ratcheting movements, engraved or printed chapter markers, or complications such as a tachymeter.Ĭhronograph: Functioning similarly to a stopwatch, a chronograph is a unique and valued complication due to its ability to measure increments of elapsed time while the watch still maintains traditional timekeeping abilities.
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