Kinetic Auto Relay is a quartz technology Seiko introduced in 1999. At heart it works like any Kinetic: an internal rotor spins with wrist motion, that motion is converted to electricity, and the charge is stored in a rechargeable Lithium-Ion cell Seiko calls the Kinetic Electricity Storage Unit (E.S.U.). What sets Auto Relay apart is its power logic. If the watch goes 72 hours with no movement, it stops the hour and minute hands and drops into a sleep mode that conserves roughly 85 percent of its charge. The integrated circuit keeps counting time the whole while, so when you shake the watch awake the hands fast-forward themselves to the correct time. Fully charged, it can hold accurate time in sleep for up to about four years.
Real references show the system's range. The SMA163 is an all-titanium piece with a carbon-fiber dial and 100m water resistance (5J22-0D80). The SBYA007 is another titanium Auto Relay (5J22-0B80), while the SMA025 and SMA033 sit among the earlier examples, and an SMA025 even lives in the Science Museum Group collection. The Sportura and Arctura collections both spawned Auto Relay variants too. These watches run calibers 5J21, 5J22 and 5J32. On the 2024-2025 used market expect roughly $128 to $550 depending on reference, material and condition: Arctura examples land near $311, the SBYA007 around $370, and a Sportura Kinetic Auto Relay around $513, with Chrono24 Auto-Relay listings often sitting in the $400 to $550 band.
A few practical things to check before buying. The E.S.U. is the part that ages: a Kinetic left dormant for years can have a tired cell, so ask the seller how many days it runs off a full charge, and budget for a modest Seiko-service replacement if needed. Titanium models wear lighter and gentler on skin; the steel ones feel a touch more substantial. Auto Relay genuinely suits a multi-watch owner who rotates pieces, because the one in the drawer still shows the right time when you grab it months later. It is a sweet middle ground for anyone who wants daily convenience without battery-change appointments or the fuss of automatic winding.
One nuance worth knowing: Auto Relay is no longer in production, and the wider Kinetic line has largely been phased out, so these are collector and pre-owned plays rather than boutique buys. Historically it descends from Seiko's Automatic Generating System (AGS), shown in production form in 1988, with the Kinetic name arriving in 1993; Auto Relay is the chapter that added the sleeping intelligence. It is not for the buyer chasing pure mechanical feel, but it rewards anyone who likes smart, low-maintenance quartz with a bit of history.