S. Epson Caliber AL21E

Manufacturer	S. Epson Corp. (Seiko)
Caliber Number	AL21E
Movement Type	Quartz, battery-powered
Lignes	6.75”’ x 8”’
Diameter	15.3mm x 17.8mm
Height	2.99mm
Jewel Count	0
Frequency	32,768 Hz
Accuracy Rating	+/- 20 seconds/month
Battery Cell	SR626SW / 377 (silver oxide, 1.55 V)
Battery Life	2 years
Quartz Type	Tuning fork
Regulator?	None
Stem Part #	0354788 (aka 354-788) / 0354787 (354-787)
Hand Count	3
Hand Sizes	1.10mm (hours) / .65mm (mins) / .20mm (secs)
Functions	Central hours; central minutes; central seconds
Hacking Seconds?	Yes
Country of Manufacture	Made in Japan
Known Models	(Add your watch to the comments below…)

The S. Epson caliber AL21E is a small size 3-hander quartz movement. Official documentation indicates that this caliber has been in production since at least 2014.

This is a true no-date movement with only two crown positions: neutral (against the case) and time setting mode (pulled out one click).

Replacement Prices:

At the time of this post, replacement prices for the AL21E were found online in the range of $2.70 USD to $8.95 USD.

Additional Resources:

• Official tech sheets/drawings (pdf)