Seiko 7R68 - Manual (Page 11)

11
English
1 Main functions ........................................ 3 hands (hour, minute and second hands), calendar, and
power reserve indicator
2 Frequency of crystal oscillator ................ 32,768 Hz (Hz = Hertz … Cycles per second)
3 Loss/gain (monthly rate) .......................... Less than 15 seconds at normal temperature range (5
°
C ~
35
°
C) (41
°
F ~ 95
°
F) (Corresponding to a daily rate of less
than 1 second)
4 Operational temperature range ............... –10
°
C ~ +60
°
C (14
°
F ~ 140
°
F)
* When using the watch in low temperatures, keep the
power reserve indicator above “1/4”.
5 Driving system ........................................ Manual winding mechanism
6 Hand movement system ........................ Sweep-movement second hand
7 Duration of operation .............................. Approx. 48 hours. (If the watch is fully wound with the
power reserve indicator pointing to “1”)
8 IC (Integrated Circuit) .............................. Oscillator, frequency divider and spring drive control circuit
(C-MOS-IC), 1 piece
9 Jewels ..................................................... 30 jewels
* The specifications are subject to change without prior notice for product improvement.
SPECIFICATIONS