A silver full sized open faced chronograph Waltham pocket, sterling silver, AWWCo Waltham, white dial, Roman numerals, crown wind, case hallmarked Wj London 188152399. movement engraved AW Co Waltham, Mass 2469758 Pat. Sept 28.80. English Pat no 3244 total weight: 123.5 grams,
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- Sterling Silver - Sterling silver is a mixture of 92.5% pure silver and 7.5% of another metal, usually copper. Fine silver is 99.9% pure silver, and is relatively soft and the addition of the very small amount of copper gives the metal enough strength and hardness to be worked into jewellery, decorative and household objects.
- Crown Wind - A winding method for a watch, using a knurled or fluted knob, located at 3 o'clock on a wristwatch and 12 o'clock on a pocketwatch.
- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- Chronograph - A chronograph is a watch that also incorporates the features of a stopwatch, to measure elapsed time. Most chronographs are operated by two buttons, one to start and stop the chronograph second hand, and the other to return that hand to the starting position.
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