Have had a Seiko Kinetic Auto-Relay for more than 10 years. Still keeps perfect time despite being constantly worn. Has large, easy to see numbers. Have worn cycling, using nail gun or operating power equipment in my wood shop, when doing car repairs/maintenance. It has some scratches and a metal blob on the case at 1 o'clock(from an accidental car battery arc). I did replace the crystal a couple years ago, so it still looks pretty good, but was told capacitor could fail soon. No battery, wearer's motion generates electricity that is stored in a capacitor to power a quartz movement, so no mechanical winder mechanism, which makes it less heavy than an autowinder. The auto-relay feature lets it go to sleep but still keep time for up to 4 years when no motion. Model I have is still available N.O.S. on the Bay, maybe I should pick up a spare.
