MOVEMENT CALIBER NUMBER: 6N01, PRECISION QUARTZ ±15 SECONDS PER MONTH. BATTERY LIFE APPROX. 3 YEARS CASE MATERIAL: STAINLESS STEEL CASE SIZE: THICKNESS:8.9MM DIAMETER:34.0MM LUG-TO-LUG:40.8MM CRYSTAL: CURVED SAPPHIRE CRYSTAL LUMIBRITE ON HANDS AND INDEX(ES) CLASP: THREE-FOLD CLASP WITH PUSH BUTTON RELEASE DISTANCE BETWEEN LUGS: 16MM WATER RESISTANCE: 20 BAR MAGNETIC RESISTANCE: 4,800 A/M FEATURES A MOTHER OF PEARL DIAL & SCREW CASE BACK.