Spring Drive is a unique watch movement developed by Seiko that combines the accuracy of quartz with the traditional mechanics of a mechanical watch. It uses a mainspring to store energy, which is then regulated by a quartz oscillator, allowing for precise timekeeping while providing a smooth sweeping second hand. This innovative technology offers several advantages, including a long power reserve and resistance to temperature changes. Spring Drive watches are known for their craftsmanship and are often considered a blend of art and engineering, appealing to both watch enthusiasts and collectors alike.