Seiko 8T68

The Seiko 8T68 is a Japanese-made quartz mechaquartz chronograph movement with zero jewels. It uses an SR936SW battery with a stated life of 36 months and maintains accuracy within ±15 seconds per month. The movement features a central stopwatch hand and a 60-minute totalizer at 10:00, capable of counting up to 60 minutes in one-second intervals. It remains in production.