PARTS LIST / TECHNICAL GUIDE
Automatic Cal.4R57A
Driving
system
Automatic winding with manual winding mechanism
Additional function
・
Date correction function
・
Second hand stop function
Crown
Manual winding (Clockwise only)
operation
Date setting (Counterclockwise only)
Time setting (Hour and minute)
Vibration per hour
21,600 vibrations
Daily Rate
Between
＋
45
～ －
35
seconds
(Between 5
℃
and 35
℃
)
Loss/Gain
Instantaneous rate at T0
Isochronous fault
（
Fully would condition)
Standard rate
Testing
positions
Dial upward 6 o'clock at
9 o'clock at
Dial upward
for measurement
the top
the top
Measuremen
t
（
Daily rate in
+25 s/d
+35 s/d
+35 s/d
±30 s/d
seconds
：
s/d
）
-15 s/d
-25 s/d
-25 s/d
Regulation system
ETACHRON system
Lift angle of the escapement
53°
Continuous operating time
From fully wound to stoppage
：
approximately
41
hours
Jewels
29 jewels
1/14
Cal. No.
Normal position
Item
4R57A
2nd click
1st click
・
3 Hands (Hour, Minute, Second)
・
Date calendar Hand
・
Power reserve indicator
Movement Size
・
Outside diameter: Ф29.36mm
・
Height
：
6.63 mm
