A system to protect the delicate, fragile pivots on the balance staff against breakage. The flat jewel and endstone are spring-loaded in, respectively, the main plate and balance cock. When the watch is subjected to a strong blow, these bearings “give” laterally and/or vertically. According to ISO standards, a watch described as “shock-resistant” should survive a fall from a height of one meter onto an oak floor. The best-known and most common shock-absorption system is called Incabloc.
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