Seiko TMI SII caliber PC21S movement

Hattori SII Caliber PC21S

Seiko TMI SII caliber PC21S movement

ManufacturerHattori aka Seiko Instruments Inc. (SII)
Caliber NumberPC21S
TypeQuartz
Size18.5mm x 3.15mm thick (overall height 4.8mm)
Battery Cell NumberSR626SW
Frequency32,768 hz
Quartz TypeTuning fork type quartz crystal
Stem354222 / tap 10
Hand Sizes1.20 / .70 / .17mm
Jewels0
FunctionsHours, minutes, seconds
Country of ManufactureSingapore
Known Models Most cheap quartz watches from China. Add yours to the comments below.

The Seiko Instruments caliber PC21S is a 0 jewels quartz movement found in many ultra-entry level timepieces.

Labeling

You might find this caliber listed as being produced by Hattori aka Epson aka TMI (Time Module Inc) aka Seiko Instruments Inc. We’re not sure why all the different names, but sure they all lead back to Seiko. Learn more about this here.

Accuracy

The documentation from Time Module states an accuracy of “Less than 30 seconds per month at normal temperature range.”

Replacement Prices

Replacement prices of $7.95 were found online at the time of this post.

Official Documentation

  • Official TMI tech sheets and drawings here

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20 dollars or less, let's see them! - Page 408
2 years ago

[…] took the photo sharp enough to zoom in: (still hardly readable) It's a PC21S, made in Singapore, according to this site (first hit in google…don't know how dependable the info is), it leads back to Seiko. […]

tigbwat
tigbwat
2 years ago

And by “Most cheap quartz watches from China” you do mean fake watches right?

LewisB314
LewisB314
1 year ago
Reply to  tigbwat

Fake only if they try to sell it as something it isn’t. I’ve bought a few that were very open about Made In China, shipped from China. Nothing fake about it, it was a Chinese watch.

Todd
Todd
1 year ago

Thank you for the info on this, I saw this movement in the Curren model 8266 and I had wondered who the manufacturer was. Excellent quality for the cost of this budget timepiece! Even though it is one of Seiko’s cheaper movements, the quality is still going to be much better than a lot of the other Chinese quartz movements that use plastic gears.

Herb
Herb
4 months ago
Reply to  Todd

This has plastic gears too. You can see in the pictures.

Eustachy
Eustachy
1 year ago

One of the names of these cheap Chinese quartz watches was TWINS. After 20 years, mine is still quite pecise though, about 2 seconds per week.

Olivia Gabriela Ruginosu
Olivia Gabriela Ruginosu
10 months ago

Of mine is write Gucci quartz , is very old and has the same thing on the back like this one . So it’s fake yeah ?

Jerry's Watch Frenzy
Jerry's Watch Frenzy
10 months ago

I don’t know but probably. This mechanism is used in many fakes.

Herb
Herb
4 months ago

Gucci would never use this movement. Gucci is a luxury brand whose watches cost thousands. This mostly plastic movement is one of the cheapest in the world.

Daimon
Daimon
7 months ago

Tengo uno Montreal Carlo q dice en la tapa Japón eso es bueno?

Carolyn
Carolyn
4 months ago

I’ve installed a new battery in this movement but the watch still won’t run. Does anyone know why?

Herb
Herb
4 months ago
Reply to  Carolyn

The battery could be bad, maybe you shorted it while installing it. Is it possible the movement wasn’t working to begin with and you just thought it was the battery?

Herb
Herb
4 months ago

What I love about movements like this is that they are so cheap you just replace the entire thing. Nothing to fix, nothing to worry about, just pop a new one in if you know what you’re doing. It’s quartz so it works just as good as any other quartz would.

Nplus1 Watches
Nplus1 Watches
3 months ago

I bought a Daiso Rosso Bianco watch for 500 yen (less than $5) a couple years ago and it’s amazing to me how accurate this movement is. I set it couple months ago to atomic time, and right now it’s only 5 sec slow. It’s the most accurate, yet cheapest, watch I have in my collection of quartz and mechanical watches.

Ludwig
Ludwig
3 months ago
Reply to  Nplus1 Watches

Yes! I bought also last year a daisy watch, called antique watch. The same movement is inside. On the package they have written: With a movement made by a Japanese company, manufactured in singapore. And it is a Sii Seiko movement! Very accurate! I have bought three watches more…

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