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https://faq.watchbuys.com/article/show/113520-what-does-17-jewels-mean
Higher grade watches have traditionally used a jeweled movements, which means that jewels (originally natural ruby, now synthetic ruby) were actually used in the movement. These jewels are functional - they are used as the bearings for the wheel trains and in high wear parts such as the escape lever and impulse jewel. A lower-end movement from before 1970 would typically use 5 or 7 jewels ...
https://theoremawatches.com/blogs/news/what-does-17-jewels-mean-in-a-watch
Higher grade watches have traditionally used a jeweled movements, which means that jewels (originally natural ruby, now synthetic ruby) were actually used in the movement. These jewels are functional - they are used as the bearings for the wheel trains and in high wear parts such as the escape lever and impulse jewel. A lower-end movement from before 1970 would typically use 5 or 7 jewels ...
https://www.youtube.com/watch?v=3MocClUDXtw
Mar 16, 2017 · Seiko 23 Jewel Watches:Seiko Presage: https://amzn.to/2pkWMKoSeiko SNZH53: https://amzn.to/2D8lKGGSeiko 5 SNZG09K1: https://amzn.to/2DaRc7kSeiko Save the oce...Author: Vintage Watch Collector
https://www.prestigetime.com/blog/what-are-the-jewels-in-a-watch-for.html
A watch with 17 jewels is often called a fully jeweled watch. This means that it uses jewel (usually ruby) bearings in the mechanical movement from the balance wheel all the way to the center wheel pivot. What does 21 jewels mean in a watch?
https://www.watch-wiki.net/index.php?title=Incabloc
Incabloc is a common shock protection system used in mechanical watches, recognizable due to its lyre-shaped spring.. History. Incabloc was developed and trademarked in 1933 by Portescap.It prevents a watch balance staff from breaking by allowing it to move slightly, both laterally and vertically, using a spring-mounted jewel setting. Incabloc is easy to recognize due to the golden shield- or ...
https://uk.answers.yahoo.com/question/index?qid=20070923043206AAaSFPV
Sep 23, 2007 · When the watch says "17 jewels" it is referring to the number of rubies in the movement (this one would be mechanical) that act as bearings for moving parts. The reference to …
http://www.pocketwatchrepair.com/how-to/what-is-my-watch-worth.php
Below 15 jewels is considered a lower-grade watch. 15-17 jewels would be considered a fully-jeweled, mid-grade watch, and 19, 21, 23 or 24 jewel movements would be considered higher-grade. Sometimes the number of jewels is clearly marked on the movement, as in "19J", and sometimes it can only be determined by a watchmaker examining the watch.
http://www.secondtimearoundwatchco.com/vintageWatchGuide/
A higher jewel count does not necessarily make one watch better than another. Typically most modern mechanical wristwatches will have at least 17 jewels, but more or fewer jewel counts are not uncommon. A watch with a higher jewel count will usually have more complications and more working parts.
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