Cal. NO |
7R87 7R88 |
7R89 |
7R99 |
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Features |
Hour hand, minute hand, seconds hand, date, power reserve indicator |
Hour hand, minute hand, seconds hand, moon phase display, power reserve indicator |
Hour hand, minute hand, seconds hand, power reserve indicator |
Frequency of crystal oscillator |
32,768 Hz (Hz = Cycles per second) |
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Loss/Gain |
Within 15 seconds per month (equivalent to 1 second per day) (If the watch is worn on your wrist within normal temperature range between 5 °C and 35 °C.) |
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Operational temperature range |
-10°C ~ +60°C Under a low-temperature condition (below 0 °C), always keep at least one-fourth of the watch power shown by the power reserve indicator. |
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Driving system |
Manual winding type |
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Duration |
Approx. 48 hours |
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IC (Integrated Circuit) |
Oscillator, frequency divider, and spring drive control circuit (C-MOS-IC): 1 piece |
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Hand movement |
Glide motion |
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Jewels |
30 jewels |
32 jewels |
Cal. NO |
5R77 |
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Features |
Hour hand, minute hand, seconds hand, moon phase display, power reserve indicator |
Frequency of crystal oscillator |
32,768 Hz (Hz = Cycles per second) |
Loss/Gain |
Within 15 seconds per month (equivalent to 1 second per day) (If the watch is worn on your wrist within normal temperature range between 5 °C and 35 °C.) |
Operational temperature range |
-10°C ~ +60°C Under a low-temperature condition (below 0 °C), always keep at least one-sixth of the watch power shown by the power reserve indicator. |
Driving system |
Automatic winding type (with manual winding function) |
Duration |
Approx. 72 hours |
IC (Integrated Circuit) |
Oscillator, frequency divider, and spring drive control circuit (C-MOS-IC): 1 piece |
Hand movement |
Glide motion |
Jewels |
30 jewels |
The specifications are subject to change without prior notice due to product improvement.