I can discern no functional advantage for them to do so in a watch bracelet, and 904 grade steel is approximate 3 times more expensive than 316L. My research indicates 904 grade steel is more commonly used in industrial components which under constant exposure to highly corrosive substances (acids and the like) conditions which a watch bracelet simply will not be exposed to. Therefore, there is no appreciable benefit to the 904 grade steel in the Rolex bracelet as compared to 316L used in the Omega bracelet. Indeed, no other watch manufacturer uses 904.
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