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The original Fifty Fathoms carried the trademark “LIP Blancpain”, LIP was a watch retailer in Paris and manufacturer in Besançon. Jean-Jacques Fiechter, Blancpain's CEO from 1950 until 1980, a diver himself, developed the Fifty Fathoms model.
Incabloc, ie shock protection for the balance pivots of the balance staff was developed in the late 1940's. This was a considerable evolution in practical watchmaking. Prior to Incabloc, when watches received shocks, the balance pivots could be easily broken and the watch would stop. This was such a phenomena that the military would employ watch technicians to repair the watches that were being damaged in action. Antimagnetic/waterproof & shockproof, even automatic, as engraved below were all technological advances of the period and used as strong selling points.
https://www.thenakedwatchmaker.com/deco ... tage-fifty
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