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https://www.amazon.com/Seiko-Automatic-Jewel-SNK809K1-SNK809K/dp/B0046ZSJGM
Buy Seiko 5 Automatic 21 Jewel Men's Watch SNK809K1 SNK809K and other Wrist Watches at Amazon.com. Our wide selection is eligible for free shipping and free returns.4.2/5(103)
https://strapchange.com/what-are-watch-jewels-what-does-21-jewels-mean/
As for the referenced watch above (Seiko 5 Snk809), which has one of Seiko´s highly used and robust movements (the 7S26), there are 21 jewels inside. I assume Seiko use synthetical jewels and that they have made many attempts, in trying to create the best movement, with the most optimal amount of jewels …
https://www.etsy.com/market/21_jewels_watch
Did you scroll all this way to get facts about 21 jewels watch? Well you're in luck, because here they come. There are 1045 21 jewels watch for sale on Etsy, and they cost $104.95 on average. The most common 21 jewels watch material is metal. The most popular color? You guessed it: silver.
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://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://www.prestigetime.com/blog/what-are-the-jewels-in-a-watch-for.html
Around 17 stones are used on a standard mechanical jewel watch without any high-complications, in some cases, 21 jewels are used to minimize positional errors as mentioned above.
https://diefendorffwatches.com/blogs/news/what-are-jewels-in-a-watch
But keep in mind, jewels are in the watch movement itself, so unless you have a see-through case back, you probably won’t even see them. Yep, you guessed it, our first collection of watches will have a see-through case back. The watches we’ll sell with have 26 jewels.
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