Seiko 4R57A Technical Manual

Parts List / TECHNICAL GUIDE
Item
・3 Hands (Hour, Minute, Second)
・Date calendar Hand
・Power reserve indicator
Driving system
Additional function
Normal position
Crown
1st click
operation
2nd click
Vibration per hour
Daily Rate
Loss/Gain
Standard rate
for measurement
Regulation system
Lift angle of the escapement
Continuous operating time
Jewels
Automatic Cal.4R57A
Cal. No.
Automatic winding with manual winding mechanism
・Date correction function
・Second hand stop function
Manual winding (Clockwise only)
Date setting (Counterclockwise only)
Time setting (Hour and minute)
21,600 vibrations
Between ＋45 ～ －35 seconds
(Between 5℃ and 35℃)
Testing positions
Measurement
（Daily rate in
seconds：s/d）
ETACHRON system
53°
From fully wound to stoppage ： approximately 41 hours
29 jewels
4R57A
Movement Size
・Outside diameter: Ф29.36mm
・Height：
Instantaneous rate at T0
（Fully would condition)
Dial upward 6 o'clock at
the top
+25 s/d +35 s/d
-15 s/d -25 s/d
1/14
6.63 mm
Isochronous fault
9 o'clock at Dial upward
the top
+35 s/d ±30 s/d
-25 s/d