Seiko Instruments Inc. VD54B

The VD54B is a quartz chronograph movement manufactured by SII in Japan. Measuring 3.97 mm in height, it uses an SR920SW battery and contains no jewels. The movement offers chronograph functionality with a 30-minute counter at 9:00 and a running seconds subdial at 6:00, while the central hand displays the current time. Accuracy is rated at ±20 seconds per month within normal temperature ranges. The caliber is used primarily in fashion and entry-level chronograph watches.