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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 ...
The timepiece own case, comprising movement, dial, winding and hand-setting mechanism, forms an autonomous unit which in turn is enclosed by a two-part metal case. These parts can be drawn apart, like curtains, to reveal the dial and check the time. [8] The idea was offered to different watch makers but only Movado took it up.
The rate of pay was about a penny and a half per dial (equivalent to $0.368 in 2024 [8]), earning the girls $3.75 (equivalent to $92.04 in 2024 [8]) for painting 250 dials per shift. The brushes would lose shape after a few strokes, so the USRC supervisors encouraged their workers to point the brushes with their lips ("lip, dip, paint"), or use ...
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]
The Model 23 was a 16-size chronograph pocket watch. The Model 4992b was in a 16-size case with a black dial. It was used as the pocket watch for the U.S. military, featuring a less accurate 21-jewel railroad grade movement. [citation needed] By 1970, 13,086 Hamilton Model 21 Marine Chronometers had been produced.
In some cases, both Invicta and Waltham were on the dial. Other cases will only show a “W” to indicate that this watch was manufactured by Waltham for Invicta. Later in the 1970s, Waltham was merged into a federation with other Swiss makers of inexpensive watches, the Société des Garde-Temps SA (SGT).