National Geographic NG710 SERIES Instruction Manual - page 5
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WATCH SPECIFICATIONS
Movement caliber: OS21 Diameter: 30.80 mm Height: 5.10 mm
Battery: Silver oxide SR927W or equivalent
Battery life: Approximately three years, assuming 60 minutes
chronograph operation a day
Chronograph: 1/100 second basis, up to 59 minutes, 59 seconds
Water-resistance: 20 ATM, 200 m
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