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He called his theory "". To explain it, he used the analogy of a bicycle coasting down a hill: gravity provides the energy (like a mainspring), but a pacemaker sets the speed, and the rider uses brakes to stay in sync. 2. A 28-Year Struggle (1977–2005)

: In 1997 , a new low-power integrated circuit (the SOI-IC) finally allowed the watch to consume less power than it produced. buy seiko spring drive

Making this "braking" system work without a battery was thought to be impossible. He called his theory ""

: The first prototype in 1982 ran for only four hours. A second attempt in 1993 achieved about 24 hours but was still commercially unviable. A 28-Year Struggle (1977–2005) : In 1997 ,

Unlike mechanical watches that use a ticking "escapement," the Spring Drive uses a . What is Seiko Spring Drive? | WATCH EDUCATION