Great in depth look at the Spring Drive from one of Timezone’s finest.

And so we come to the latest Seiko innovation, the Spring Drive. Although virtually all mechanical watches use a spring as a power source, the Spring Drive is extremely unique in that it dispenses with the 300+ year old idea of a mechanical escapement for the regulation of time. The result is a watch that avoids the age-old problems associated with mechanical escapements such as hairsprings, delicate balance wheels, pallet forks, and escape wheels (not to mention maintenance issues).

Seiko Spring Drive: A Revolution in Time – TimeZone