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| EF-311D-1AV |
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| EF-311D-2AV |
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| EF-311D-7AV |
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Regular timekeeping
Analog: 3 hands (Hour, minute, second), 4 dials (month, date, day, 24-hour) |
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Accuracy: ±20 seconds per month |
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Approx. battery life: 3 years on SR621SW |
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Size of case/total weight
EF-311BK : 44.2 X 39.0 X 10.7 mm / 135 g
EF-311D : 44.2 X 39.0 X 10.7 mm / 135 g |
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