Seiko

Seiko Caliber 5M22: Complete Movement Guide
Seiko 5M22 factory specifications, the AGS charging system, original capacitor and revised rechargeable-unit reserve, with two documented original VWS watches.
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Seiko Scuba 200M: Vintage Dive Watches Explained
Learn how to identify a vintage Seiko Scuba 200M: compare 5H25 and 7N35 quartz models, original photographed references and the limits of an old 200m marking.
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Seiko AGS: History of the Automatic Generating System
How Seiko AGS turned wrist motion into electricity, from the 1988 launch to Kinetic. Explore 5M22 technology and two original 1990s archive watches.
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