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Jewel bearing of a balance wheel, supported by a lyre-shaped spring. The Incabloc shock protection system is the trade name for a spring-loaded mounting system for the jewel bearings that support the balance wheel in a mechanical watch, to protect the wheel's delicate pivots from damage in the event of physical shock, such as if the watch is dropped.
Shock resistant is a common mark stamped on the back of wrist watches to indicate how well a watch copes with mechanical shocks. In a mechanical watch, it indicates that the delicate pivots that hold the balance wheel are mounted in a spring suspension system intended to protect them from damage if the watch is dropped.
Backside view of an automatic watch with exhibition case back, showing its movement.The semicircular central rotor which winds the mainspring is plainly visible. Video of the rotor turning in an automatic wristwatch having a glass back, when the watch is moved by hand
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The Waltham Watch Company, also known as the American Waltham Watch Co. and the American Watch Co., was a company that produced about 40 million watches, clocks, speedometers, compasses, time delay fuses, and other precision instruments in the United States of America between 1850 and 1957.
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In the early 1980s, Invicta went bankrupt and was sold in 1983 to Ondix S.A, which continued producing Invicta watches in Switzerland. Ondix folded due to disappointing sales, and Invicta was re-established in 1991 when acquired by American owners. [5]
The international standard ISO 764 Horology—Magnetic resistant watches defines the resistance of watches to magnetic fields. According to ISO 764 or its equivalent DIN 8309 (Deutsches Institut für Normung - German Institute for Standardization) a watch must resist exposure to a direct current magnetic field of 4800 A/m.