Seiko Caliber 8T67

Manufacturer	Seiko
Caliber Number	8T67
Movement Type	Quartz, battery-powered, mecaquartz
Lignes	13.5”’
Diameter	30.8mm x 29.10mm
Height	5.1mm
Jewel Count	0
Quartz Type	Tuning fork
Frequency	32,768 Hz
Accuracy Rating	< 15 seconds/month deviation
Battery Cell	SR936SW (394)
Battery Life	~3 years (depends on chrono usage)
Hand Count	3
Hand Sizes	1.5mm / .90mm / .32mm
Functions	Central hours; central minutes; small seconds at 6:00; central chronograph seconds; 60 minute chronograph counter at 12:00; 12 hour chronograph counter at 9:00; date at 3:00 or 4:30
Hacking Seconds?	Yes
Country of Manufacture	Japan (assembled?)
Known Models	(Add your watch to the comments below…)

Seiko caliber 8T67 (8T67A) is a mechaquartz chronograph watch movement. This hybrid caliber (quartz with mechanical chronograph functionality) is made in Japan and has zero (0) jewels.  The stopwatch seconds hand on this movement moves in 1/5 second intervals.

Seiko 8T67 vs SII/TMI VK67:

The 8T67 is the Seiko branded version of the calibre VK67 – for Seiko-only watches. Both are Seiko movements.

8T67 vs 8T63:

There is a similar Seiko caliber 8T63 with the main difference being the layout of the chronograph subdials:

8T67: 12-6-9 vertical layout (like a 7750)

8T63: 3-6-9 horizontal layout (like a Rolex Daytona)

Additional Resources:

• List of Seiko movements