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2. Gallet Clamshell - Wikipedia

   en.wikipedia.org/wiki/Gallet_Clamshell

   1939 advertisement from Jewelers' Circular Keystone magazine of the Gallet MultiChron 30 "Clamshell", the world's first water resistant chronograph wristwatch Reverse view of the Gallet Clamshell showing the 4 screws that compress the 2 part case around the flared acrylic crystal Open view of the Gallet Clamshell showing top part of the two part case and complex Swiss column wheel movement ...

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4. Incabloc shock protection system - Wikipedia

   en.wikipedia.org/wiki/Incabloc_shock_protection...

   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.

5. L'impermeable - Wikipedia

   en.wikipedia.org/wiki/L'impermeable

   The watchmaker company "Alcide Droz & Sons", established in St-Imier since 1864, developed the first watch attested waterproof.They called it "L'Impermeable". They had the idea to place a seal in the crown of winder, which is screwed on the counterpart. "L'Impermeable" was born: it is the very fir

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7. Watchcase - Wikipedia

   en.wikipedia.org/wiki/Watchcase

   A case for a pocket watch, 1870. The outer clamshell protects the watch. The inner layer contains a glass window. The ring is for the attachment of a chain. A usually metal clamshell case for a mechanical watch, [1] common until the early twentieth century. It is meant to sit around the inner case of the watch. [2]