S. Epson Caliber VX44 Watch Movement

Manufacturer	S. Epson Corp. (Seiko)
Caliber Number	VX44
Movement Type	Quartz, battery-powered
Lignes	11.5.”’
Overall Diameter	26.4mm (23.5mm x 23.5mm)
Casing Diameter	25.6mm (21.9mm x 23.5mm)
Height	2.98mm
Jewel Count	No jewels (0)
Frequency	32,768 Hz
Battery Cell	SR920SW (371)
Battery Life	~3 years
Accuracy Rating	+/- 20 sec/day
Regulator	None
Stem	0351177 or 0351578
Hand Count	3
Hand Sizes	1.10mm / .65mm / .20mm
Functions	Central hours; central minutes; central seconds; day of the week at 12:00; date at 3:00
Hacking Seconds?	Yes
Country of Manufacture	Made in Japan
Known Models	(Add your watch to the comments below…)

The S. Epson caliber VX44 is an affordable quartz watch movement with a date day calendar complication.

The day-day layout on the VX44 resembles the style of the widely-known Rolex Day-Date President, with a panoramic full text day of the week at 12:00 and date at 3:00.

VX44A, VX44B, VX44C…

The trailing letter at the end of the caliber number represents evolution or changes in the movement. At the time of this post, the most recent tech sheets list VX44E. The differences between each version is unknown, but this listing will be updated as we learn more.