Hattori SII Caliber PC21S

Manufacturer	Hattori aka Seiko Instruments Inc. (SII)
Caliber Number	PC21S
Type	Quartz, battery-powered
Diameter	18.5mm
Height	3.15mm thick (overall height 4.8mm)
Jewels	0
Frequency	32,768 Hz
Battery Cell Number	SR626SW
Estimated Battery Life	2 years
Quartz Type	Tuning fork type quartz crystal
Stem	354222 / tap 10
Hands Count	3
Hand Sizes	1.20 / .70 / .17mm
Functions	Central hours; central minutes; central seconds
Country of Manufacture	Made in Singapore
Known Models	Many cheap quartz watches from China (Add your watch to the comments below…)

Seiko Instruments caliber PC21S is a 0 jewels quartz movement found in many ultra-entry level timepieces. This 3-hander caliber is a true no-date movement.

Note: This caliber number is often misread as “PC215”.

Manufacturer Labeling:

You might find this caliber listed as being produced by Hattori aka Epson aka TMI (Time Module Inc) aka Seiko Instruments Inc. Learn more about this here.

Country of Origin Labeling:

You also may see sellers listing this as a “Japan” movement or “made in Japan”, despite the movement actually being signed “Singapore”.

Accuracy Rating:

Official claims from Time Module, Inc. states an accuracy of “less than 30 seconds per month at normal temperature range,” aka +/- 30 seconds/month.

Replacement Prices:

Replacement prices for the calibre PC21S were found in the range of $2.00 to $7.95 USD at the time of this post.

Drawing:

Additional Resources:

• Official TMI tech sheets/drawings (pdf)
• Similar Cal. PC21J