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  2. Elgin National Watch Company - Wikipedia

    en.wikipedia.org/wiki/Elgin_National_Watch_Company

    The company built the Elgin National Watch Company Observatory in 1910 to maintain scientifically precise times in their watches. The company produced many of the self-winding wristwatch movements made in the United States, beginning with the 607 and 618 calibers (which were bumper wind) and the calibers 760 and 761 (30 and 27 jewels respectively).

  3. Zodiac Watches - Wikipedia

    en.wikipedia.org/wiki/Zodiac_Watches

    Zodiac Watches, or simply Zodiac, is an American [1] brand of Swiss-made watches founded in 1882 by Ariste Calame in Le Locle, Switzerland. The company mostly focuses on its dive watches through its Sea Wolf line, [ 2 ] one of the first modern dive watches, which debuted in 1953, before the Rolex Submariner and after Blancpain Fifty Fathoms. [ 3 ]

  4. Omega Seamaster Omegamatic - Wikipedia

    en.wikipedia.org/wiki/Omega_Seamaster_Omegamatic

    The Omega Seamaster 200 Omegamatic is a midsize automatic quartz watch that Omega produced from 1997 until 2000. It has stainless steel case and bracelet (Bond style with gold Omega symbol clasp), screw-in crown and caseback, engraved with the Omega Hippocamp logo, 200 meters water resistant, unidirectional bezel, silver or black dial with orange accents, sapphire crystal (anti-reflective ...

  5. Water Resistant mark - Wikipedia

    en.wikipedia.org/wiki/Water_Resistant_mark

    The watch shall be placed on a heated plate at a temperature between 40 °C and 45 °C until the watch has reached the temperature of the heated plate (in practice, a heating time of 10 minutes to 20 minutes, depending on the type of watch, will be sufficient). A drop of water, at a temperature between 18 °C and 25 °C shall be placed on the ...

  6. Omega Seamaster - Wikipedia

    en.wikipedia.org/wiki/Omega_Seamaster

    The original Seamaster's key feature was an O-ring gasket used to provide its waterproof seal. This design had been developed for use in submarines during the war and turned out to also be useful for watches, where it made them much less vulnerable to temperature and pressure changes than earlier lead- or shellac- based gasket designs. The ...

  7. Waterproof wristlet watch - Wikipedia

    en.wikipedia.org/wiki/Waterproof_wristlet_watch

    The obvious characteristics of a trench watch were that they were repurposed small sized (size 0, 7.5 Ligne, 29.62mm) pocket watches protected with crude metal used to protect the glass crystal covering the dial. The invention of the trench watch precipitated the invention of the wrist watch, and these watches were adopted by both the public ...