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https://www.prestigetime.com/blog/what-are-the-jewels-in-a-watch-for.html
Dec 11, 2020 · What does 17 jewels mean? 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://diefendorffwatches.com/blogs/news/what-are-jewels-in-a-watch
What does 17 jewels mean? Watches have tiny pieces of synthetic ruby inside of them to help in the frictionless movement of the many tiny parts in your watch - 26 jewels simply means that there are 26 of them and 17 mean that there are 17 of them. Are the jewels in a watch …
https://quillandpad.com/2018/06/29/the-number-of-jewels-in-a-watch-movement-indicates-value-doesnt-it-a-myth-debunked/
Jun 29, 2018 · Jewels that are added only to increase the jewel count add expense to the manufacture of the watch, without providing any real benefit. Jewels are meant to provide wear protection to friction surfaces to prevent the watch from breaking down after only a short period of time in use because it takes a gemstone longer to wear away than bare metal.
https://mybulova.com/node/4358
A fully jewelled watch has 17 jewels, cap jewels bump it up to 21 or 23. You can include jewels elsewhere, for example, Enicar was notable because they used a ruby pin as an axle for the minute wheel. It is functional, but hardly necessary. Higher jewel counts in automatic watches reflect additional jewels in the self winding system.
https://www.elgin.watch/enwco/elgin-movement-grades/
Is a 5/0 size, 17-jewel, sweep second calendar automatic : 5/0s: 17: 886: Swiss: PES 7011: Feb-1964: Is a 8/0 size, 17-jewel, no second and small second model movement : 8/0s: 17: 887: Apr-1964: Is a 13/0 size, 17-jewel, small second model movement : 13/0s: 17: 889: FONT 72: Apr-1964: Is a 5/0 size, 17-jewel, sweep second wheel model movement ...
https://strapchange.com/what-are-watch-jewels-what-does-21-jewels-mean/
It says: “21 jewels” on both of them. So does that mean they contain jewels (diamonds, sapphire and rubies) and other precious stones?? Model: Seiko 5 Snk809 What does “21 jewels” mean? As all watches have many moving parts, jewels were inserted to lessen the wear and tear on the bearings and other pivot points.
http://www.secondtimearoundwatchco.com/vintageWatchGuide/
Watch jewels are simply bearings, which are used to decrease friction and wear in the movement of a watch. Though “jewels” were originally created by a process of piercing precious gems, since the early 1900s, most jewels are synthetically-created rubies or sapphires, which have very little inherent value.
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