Seiko 7S26 watch, balance wheel

This is a Seiko 7S26 movement, display back. It shows the balance wheel in motion.

Category:

Science & Technology

Tags:

• 7S26
• Seiko
• Watch

[ducttaperulestheworl]

what does those jewels mean?

I got one and it says 25 jewels and this watch say twenty one jewels.

does it mean like there's 21 jewels in a watch or it's a type of jewel?

[sandbender1414]

Jewels means how many ruby jewels are in the movement. They are used to reduce friction and extend the life of a watch. The minimum of a decent watch is 17, 21 to 25 is typical. Generally anything over 25 is just for show.

[sandbender1414]

They truly are built to last a lifetime. I was speaking with a co-working who was wearing a Seiko 5, the one on his wrist was 10 years old, no servicing. He had one for 20 YEARS with no service. He just got tired of the style and gave it away, still running!

[douro20]

These things are marked with the Seiko name in four places: on the pallet bridge, on the lower plate next to the balance, on the plate carrying the selfwinding mechanism, and on the rotor. As with all Seiko mechanical movements, this one is built to last a lifetime.

[Nebraskahusker23]

@sandbender1414 Actually watches with more than 25 jewels usually have a specific purpose. Usually that's a chronograph, dual spring barrels, or they're just incredibly accurate. Just look at Jaeger Le-Coultre's 8 day movement.

[null140]

@ferd9191 hi there. that little section is the regulator; it's basically a little lever that can be moved incrementally, between the '+' and '-' signs to speed up, or slow down the watch, respectively. you would regulate a watch this way (or get it done by a pro.) if it was running unreasonably fast or slow, say by a couple of minutes or more a day. i've regulated an old watch from the 50s this way, and now it runs pretty darn accurately for such an old, potentially unserviced watch!

[ferd9191]

I have the exact same watch! I don't know much about automatic watches, but i'm just wondering what the + and - sign stands for? There seems to be an arrow pointing somewhere in between them above the spinning wheel

[firewalled1951]

@CharlieDoan

In 1956 (55 years ago and not 70 years) Seiko watch company produced the first self winding (automatic) wristwatch made in Japan. Seiko also created the world’s first quartz chronometer in 1964 Seiko was the official timer of the Olympics summer games in Tokyo.

A curious piece of information that people seldom know is that my great great grandfather invented the self cleaning electric oven in 1735, 160 years before AC electricity was invented by my other grandfather, Nokolai Tesla

[dimonalmaty]

@CharlieDoan funny thing is that seiko 5 with 100m waterproof is said to be made in japan, however it is so much cheaper than black monster which is not made in japan. I couldnt get it, but generally those cheap seiko 5 models are not pf same quality (bracelets, lead etc.)

[keesdegroot2004]

I have the same. Just perfect! Swimming, shower, no problem for this watch.

[UltraViolence14]

@CharlieDoan old seiko mechanicals and Automatics last forever not the new auto 7s series 

[CharlieDoan]

@UltraViolence14

My Great Grand Father past down a SEIKO to 3 generations and NOW to me, the AUTOMATIC watch more than 70 years old and the watch STILL RUN ON TIME. I just let you know that , of course you like or u don't like ..who care but I knew the quality of SEIKO..again I am not a Japanese.

[CharlieDoan]

@UltraViolence14

Get 7s26B (The most accuracy of 7S (newest design and improve by Seiko engineer)

7S26A is the oldest

With today is 7S26...little more money you look for 7S36 with 23 Jewels, this is more ontime and better ($) Look for Made in Japan models are the first think I do ( I'm not a Japanese but whatever work best for us)

GOOD LUCK

[CharlieDoan]

@samstterhamstteer 30m..or just said water resistant.....very weak!! = You can wash your hand with a little big WET....Safe if you get 100m water resistant so you can swim (not dive) with it.