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Ruby jewel bearings used for a balance wheel in a mechanical watch movement Cross-section of a jewel bearing in a mechanical watch. This type of donut-shaped bearing (red) is called a hole jewel, used for most of the ordinary wheels in the gear train. It is usually made of synthetic sapphire or ruby, press-fit into a hole in the movement's ...
A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock. It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring , known as the balance spring or hairspring .
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ASUAG (Allgemeine Gesellschaft der Schweizerischen Uhrenindustrie), formed in 1931, was the world's largest producer of watch movements and the parts thereof (balance wheels, balance springs, assortments, watch stones ("jewels")). ASUAG had also integrated an array of watch brands in 1972 into a sub-holding company, General Watch Co. ASUAG ...
The National Association of Watch and Clock Collectors describes Regina watches as an inferior brand of Omega, but mentions that some were adjusted highly enough to be used as railroad timepieces, which was the standard for quality watches. [2] [3] The use of Regina watches for railroad timekeeping is documented on other sites as well. For ...
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The balance spring is a fine spiral or helical torsion spring used in mechanical watches, alarm clocks, kitchen timers, marine chronometers, and other timekeeping mechanisms to control the rate of oscillation of the balance wheel. The balance spring is an essential adjunct to the balance wheel, causing it to oscillate back and forth.
To date there are only known of surviving examples from 12 of the original manufacturers and a number of these are not complete watches: Omega Electroquartz date and non date movements front Omega Electroquartz date and non date movements rear. 1. Bucherer : Branded as Bucherer Quartz and available in 18-carat gold or stainless steel models. 2.
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