Seiko Instruments Inc. VD53B

The VD53B is a quartz chronograph movement manufactured in Japan. It maintains an accuracy within +/- 20 seconds per month under normal operating temperatures. A distinctive feature is its layout: a central sweeping seconds hand for timekeeping, with the chronograph seconds displayed in a subdial at the 6 o'clock position—a configuration that allows users to operate the stopwatch while retaining a conventional running seconds display. This caliber appears in Invicta Speedway and Sea Spider models.