The Seiko Automatic Generating System (AGS), introduced in 1988 and renamed Kinetic in the early 1990s, is a quartz watch that powers itself from the motion of the wearer’s wrist. A small oscillating weight spins a generator, which charges a capacitor that runs the quartz movement, so the watch needs no battery. An early model such as the 7M22 is a steel watch with analogue hands and a date. I could not find reliable official figures for case sizes of the first models, so they are not stated here.

The idea combined the accuracy of quartz with the convenience of an automatic, and it avoided disposable batteries long before solar power became common. Seiko extended the technology through the 1990s with power reserves of several months.

Collectors regard AGS as a clever and often overlooked piece of Seiko engineering. Vintage examples are cheap and fairly collected, but their capacitors eventually fail and need replacement. Seiko has continued to make Kinetic watches in some ranges, though the 1988 AGS originals are no longer produced.