Seiko Caliber 8229A

Manufacturer	Seiko
Caliber Number	8229, 8229A
Movement Type	Quartz, battery powered
Outer Diameter	26mm
Casing Diameter	24mm
Height	3.8mm (not including the battery)
Jewels	4
Frequency	32,768Hz
Battery Cell	SR9365SW (394)
Expected Battery Life	5 Years
Driving System	2 Pole step motor
Regulator	Trimmer condenser style
Hand Count	3
Functions	Central hours; central minutes; central seconds; day/date at 3:00
Hacking Seconds?	Yes
Country of Manufacture	Japan
Known Models	Seiko Silver Wave, Seiko SQ Quartz, Seiko SQ Sports 100 (Add your watch to the comments below…)

The Seiko caliber 8229 (aka 8229A) is a quartz movement with a quickset date and bilingual day of the week. This movement is found in vintage Seiko timepieces (circa 1980 onward) and is no longer being produced.

Accuracy:

Official Seiko documentation states that the cal. 8229 has an accuracy rating of less than 15 seconds deviation per month in normal operating conditions and temperatures. Over the span of a year, the 8229 is capable of keeping time within less than 3 minutes.

Additional Resources: