Spring Drive

The Spring Drive is a watch movement that was developed by Seiko Epson through collaboration with Seiko Instruments and Seiko Holdings.

Its main and rare feature is a true continuously sweeping second hand, instead of the traditional beats per time unit as seen with traditional mechanical and most quartz watches. While virtually any quartz movement has the capability of creating a continuously moving second hand, most are electronically regulated to a single "tick" per second to conserve battery life. The original Bulova Accutron tuning fork models also featured a continuously moving seconds hand, whereas their contemporary ultra-high frequency and Precisionist quartz movements are regulated at such a high rate (as many as 16 beats per second) to give the illusion of continuous movement.