|
Cal. NO |
7R87 7R88 |
7R89 |
7R99 |
|---|---|---|---|
|
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.) |
||
|
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. |
||
|
Driving system |
Manual winding type |
||
|
Duration |
Approximately 48 hours*1 |
||
|
IC (Integrated Circuit) |
Oscillator, frequency divider, and spring drive control circuit (C-MOS-IC): 1 piece |
||
|
Hand movement |
Glide motion |
||
|
Jewels |
30 jewels |
32 jewels |
|
|
Cal. NO |
5R77 |
7R31 |
|---|---|---|
|
Features |
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) |
|
|
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) |
Manual winding type |
|
Duration |
Approximately 72 hours*1 |
|
|
IC (Integrated Circuit) |
Oscillator, frequency divider, and spring drive control circuit (C-MOS-IC): 1 piece |
|
|
Hand movement |
Glide motion |
|
|
Jewels |
30 jewels |
|
When the power reserve indicator shows a fully wound state, duration may be shortened depending on the how the product is used.
The specifications are subject to change without prior notice due to product improvement.