August 16, 2026Published by on August 16, 2026Categories Seiko 41.5mm Essentials Quartz Chronograph 8T63 100M Tachymeter Men’s WatchCaliber Number: 8T63. Stainless steel case with a screw case back and 10 bar, 100M water resistance. The dial includes a 24-hour hand, a date calendar, and a small seconds hand. Crystal: Hardlex. Precision: ±15 seconds per month.