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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 ...
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]
An open-face pocket watch made by the Swiss watchmaker Omega, c. 1970. An open-faced, or Lépine, [9] watch, is one in which the case lacks a metal cover to protect the crystal. It is typical for an open-faced watch to have the pendant located at 12:00 and the sub-second dial located at 6:00.
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As of its release in 2018, it is only available without date display and carries the same specs of movement speed, material use, structure and power reserve as the 5602. As of 2021, it also exists as MT5400, a slightly modified size version for the Black Bay 58 models with open case back to fit the sapphire case-back size.