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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]
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 ...
Resistance to water overpressure. Immersion of the watch in a suitable pressure vessel and subjecting it within 1 minute to the rated pressure for 10 minutes, or to 2 bar in case where no additional indication is given. Then the overpressure is reduced to the ambient pressure within 1 minute. No evidence of water intrusion or condensation is ...
Created Date: 8/30/2012 4:52:52 PM
The normal surface air filled watch case has a diameter of 51.4 mm (2.02 in) and a thickness of 28.5 mm (1.12 in) (domed synthetic sapphire crystal 14.3 mm (0.56 in)) to cope with the water pressure at the deepest surveyed point in the oceans.
Other requirements included a matte black dial with luminescent hands, numbers and indices, subsidiary seconds, a shatter-resistant perspex plastic crystal, a case resistant to water, dust and shock, a high-quality, isochronal and robust, 15 jewel movement, and a water-resistant winding crown of a good size. [1]
The Fahys Watch Case Co Factory in Sag Harbor 1878. The founder of the company, Joseph Fahys, was born on May 28, 1832, in Belfort, France. [3] In 1848, Fahys emigrated from France to the United States with his mother. He was apprenticed to Ulysses Savoye, of West Hoboken, New Jersey, who was one of the two first watch case makers in the United ...
Squale is a French word for shark. [7] The E is silent and it is pronounced "Skwal." In 1946, Charles von Büren created C.Von Büren SA in Neuchâtel, Switzerland. In 1959, after testing the reliability of the watch cases himself on numerous occasion, he registered the Squale trademark.
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