PARTS CATALOGUE / TECHNICAL GUIDE
Cal. 8T63A
[SPECIFICATIONS]
Cal. No.
Item
Interval of hands movement
Driving system
Additional function
Loss/gain
Regulation system
Gate time for rate measurement
Power
supply
Battery No.
Battery voltage
Battery life
Number of jewels
1/19
Crown
operation
Normal position
1st click position
2nd click position
Current consumption
Coil resistance
1 second
0 jewel
Stepping motor, 2 pieces
• Stopwatch function
60-minute stopwatch in one second increments.
• Second hand stop function
• Energy depletion forewarning function (The second hand moves at
two-second interals.)
4002054 (COIL BLOCK A)
1.45 - 1.65 K
Ω
Use 10-second gate.
SEIKO SR936SW
Nil
1.55 V
Approx. 3 years
8T63A
• 3 hands (hour, minute, and
small second hand)
• 24-hour indicator
• Date indicator
4002055 (COIL BLOCK B)
1.65 - 1.85 K
Ω
Free
Date setting(clockwise)
Time setting, hand position adjustment / resetting the circuit
Monthly rate: Less than 15 seconds (worn on the wrist at the temperature
between 5 and 35)
• Diameter
Outside: Ø 30.8 mm
Casing: Ø 29.0 mm
• Height: 5.1 mm
Movement: Less than 2.70 μA
Circuit block: Less than 0.70 μA
