S. Epson Caliber YM92A Watch Movement

Manufacturer	S. Epson (Seiko)
Caliber Number	YM92, YM92A
Movement Type	Quartz, battery-powered
Lignes	12”’
Diameter	27.6mm x 24mm
Casing Diameter	27mm
Height	3.7mm
Jewel Count	No jewels (0)
Frequency	32,768 Hz
Accuracy Rating	+/- 20 seconds/month
Battery Cell #	SR927SW / 395 (silver oxide, 1.55 V)
Battery Life	~3 years
Quartz Type	Tuning fork oscillator
Hand Count	7
Hand Sizes	1.10mm (hrs) / .65mm (mins) / .21mm (chrono secs) / .21mm (small secs) / .21mm (1/20 secs) / .21mm (chrono mins) / .90 (chrono hrs)
Functions	Central hours; central minutes; central chronograph seconds; small running seconds at 9:00; combined chronograph hours (12) and minutes subdial at 6:00; 1/20 second chronograph counter at 12:00; date at 3:00
Chronograph Layout	3-6-9
Hacking Seconds?	Yes
Other Features	Low battery warning (EOL), AC reset, quickset date
Country of Manufacture	Switzerland, Swiss made
Known Models	(Add your watch to the comments below…)

The S. Epson caliber YM92A is a quartz chronograph watch movement.

Battery Life:

The battery life in the YM92A is rated at about 3 years depending on how often the chronograph (stopwatch) function is used. The chronograph takes more energy to operate, so it can decrease the battery life faster. Seiko quotes approximately 3 years of battery life when using the chronograph for 2 hours per day. Therefore, if you never use the chronograph, you should get a longer battery life.