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https://strapchange.com/what-are-watch-jewels-what-does-21-jewels-mean/
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. Meaning all the rotating parts and other high frictional points in the watch; which before were metal againts metal parts, were exchanged with hard jewels.
https://nanadc.com/seiko-5-review/
Jan 09, 2020 · The 21 jewels you see in this Seiko 5 Sports Collection Model doesn’t only have an aesthetic value. It serves in a way to reduce friction, and improve its accuracy and longevity. Moreover, there is a warranty card and a manual instruction inside the package.4.8/5
https://www.amazon.com/Seiko-Automatic-Jewel-SNK809K1-SNK809K/dp/B0046ZSJGM
Seiko 5 Automatic 21 Jewel Men's Watch SNK809K1 SNK809K 4.2 out of 5 stars 103 ratings 8 answered questions Price: $125.00 & FREE Shipping. Details & FREE Returns Return this item for free. You can return this item for any reason: no shipping charges. The item must be returned in new and unused condition.4.2/5(103)
https://www.thewatchsite.com/threads/21-jewels-meaning.10845/
Nov 30, 2016 · 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. Quartz watches have few or none. Most Seiko mechanical watches have between 17 and 25 jewels.
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