Hattori SII Caliber PC21S
|Manufacturer||Hattori aka Seiko Instruments Inc. (SII)|
|Size||18.5mm x 3.15mm thick (overall height 4.8mm)|
|Battery Cell Number||SR626SW|
|Quartz Type||Tuning fork type quartz crystal|
|Functions||Hours, minutes, seconds|
|Country of Manufacture||Singapore|
|Known Models||Most cheap quartz watches from China. Add yours to the comments below.|
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.
The documentation from Time Module states an accuracy of “Less than 30 seconds per month at normal temperature range.”
Replacement prices of $7.95 found online.
- Official documentation from TMI here