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http://www.swiss-watches-guide.com/21-jewel-movement.html
A 21 jewel movement was – and still is - used to help keep the watch running smoothly. Tiny synthetic gem crystals are set between many of the gears, in order to reduce friction. These gems resist temperature better than metal, and hold lubricant much longer.
https://strapchange.com/what-are-watch-jewels-what-does-21-jewels-mean/
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. Meaning all the rotating parts and other high frictional points in the watch; which before were metal …
https://www.thewatchsite.com/threads/21-jewels-meaning.10845/
Nov 30, 2016 · Jewels, in watch terms, are tiny, synthetic, non-precious stones used in watch movements as bearings. These jewel bearings wear very slowly, and reduce friction in the movement. The more jewels, the higher grade the watch is (in general). A typical good quality hand-wind or automatic watch should have about 17 jewels as a minimum.
https://www.quora.com/What-does-it-mean-when-a-watch-has-21-jewels-and-what-is-their-functionality-in-the-watch-movement
Sep 14, 2019 · Jewels are a way to act as bearings for the wheels and cogs to turn on. They're made from artificial sapphire. They're placed in those places with the highest chance of friction, and are lubricated too. Some cheap movements will make do with five ...
https://calibercorner.com/miyota-caliber-8215/
Jul 15, 2014 · The Miyota caliber 8215 is a 21 jewel automatic movement, first introduced in 1977. It is made in Japan and is found in many new microbrand watches because it is easily obtainable, low cost, and considered an entry level workhorse movement. Caliber 8215 VS 8205
https://answers.yahoo.com/question/index?qid=20130612072705AA2xT8D
Jun 12, 2013 · In the case of the 21-jewel Seiko, the movement should be a 7s26 and is an automatic mechanical that relies on wrist movement to spin the rotor to get the watch ticking.
https://www.prestigetime.com/blog/what-are-the-jewels-in-a-watch-for.html
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? Similar to a 17-jewel watch that has a fully jeweled movement, but also has a few extra capstones added which are used to reduce positional errors.
https://nanadc.com/seiko-5-review/
Jan 09, 2020 · 21 Jewels Automatic Movement This features 21 jewel style movement. If you want to search for your perfect watch, this is one of the most important factors that you need to consider. In fact, if you would read a few Seiko-5 Review posts, you would notice the highlights in …
https://quillandpad.com/2018/06/29/the-number-of-jewels-in-a-watch-movement-indicates-value-doesnt-it-a-myth-debunked/
Jun 29, 2018 · Other areas in which movements utilize jewels is the calendar work. In examples such as Rolex’s calibers, the jewel is used to reduce the friction when a lever actuates against a steel cam to ensure the watch changes exactly at midnight. The jewel is mounted on the lever, thus reducing friction with the result being a smooth, precise date change.
https://www.clockworks.com/clock-movement.html
The movement number has three or four numbers, then a dash, and some more numbers, then a CM length underneath it if there is a pendulum. They are all consistent as they always have the numbers, then a dash, then more numbers. Basically if there is a dash in the movement number, and it's all numbers in the beginning with no letters like "A", it ...
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