Seiko 6R55A Technical Manual

PARTS LIST / TECHNICAL GUIDE
[SPECIFICATION]
Item
・3 Hands (Hour, minute and
second hand)＋24Hour hand
・Calendar (Date : Date disk)
・3 Hands (Hour, minute and
second hand)
・Calendar (Date : Date disk)
Driving system
Additional function
Normal position
Crown
1st click position
position
2nd click position
Vibrations per hour
Daily rate
Loss/
Gain
Standard rate for
measurement
Regulation system
Lift angle of the escapement
Power reserve
Number of Jewels
Cal.6R54A/55A
Cal. No.
・Diameter
Automatic winding with manual winding mechanism
･Instant date setting device
･Second hand stop function
Manual winding (clockwise only)
Date setting (counter clockwise only)
Time setting /Second hand stop function
21,600 (6 beats per second)
Between -15 seconds and +25 seconds per day
(worn on the wrist at temperature-range between 5°C and 35°C)
Testing positions
Measurement (daily
rate in seconds:s/d)
ETACHRON system
53°
From fully wound to stoppage: Approximately 72 hours
24 Jewels
SEIKO WATCH CORPORATION
6R54A
Movement size
Outside ： φ27.4 mm
φ27.0 mm
Casing ：
5.225 mm
Instantaneous rate at T0
(Fully wound condition)
Dial upward:
T0 (CH)
±10 s/d
6R55A
・Height
5.25 mm
6 o'clock at 9 o'clock at
the top the top
±15 s/d ±15 s/d
Isochronous fault
Dial upward
±15 s/d