Movement
[Bridge side] [Calendar side]
Cal. 8R48A
Cal. 8R49A
PARTS LIST / TECHNICAL GUIDE
Automatic Chronograph Cal. 8
R48A/8R49A
[SPECIFICATIONS]
1/24
Item
Cal. No.
8R48A/8R49A
34 jewels
Automatic winding with manual winding mechanism
+ 25 / - 15 seconds at normal temperature range
(Between 5°C and 35°C )
• Stopwatch function
Measures up to 12 hours
• Semi-instantaneous date change mechanism
• Second hand stop function
Date setting (counterclockwise only)
Time setting (Hour and minute)
Manual winding (clockwise only)
• Diameter
Outside: Ø 28.6 mm
Casing: Ø 28.0 mm
• Height:
7.62 mm
• 3 hands (hour and minute hands, and small second hand at
3 o'clock position)
• Calendar (Date: Date disk)
28,800 (8 beats per second)
Testing
positions
± 10 s/d
Measurement
(daily rate in
seconds:s/d)
Dial upward
+ 20 s/d
– 10 s/d
ETACHRON system
From fully wound to stoppage: Approximately 45 hours
Movement size
52 °
6 o’clock
at the top up
Dial upward
9 o’clock
at the top up
Isochronous fault
Instantaneous rate at T0
(Fully wound condition)
+ 15 s/d
– 5 s/d
+ 20 s/d
– 10 s/d
Driving system
Additional function
Crown operation
Daily Date
Regulation system
Number of jewels
Normal position
1st click position
2nd click position
Lift angle of the escapment
Vibration per hour
Coutinuous operating time
Standard rate
for movement
Loss/Gain
