Seiko 6R24A Technical Manual
PARTS LIST / TECHNICAL GUIDE
Automatic Cal. 6
R24A
[SPECIFICATIONS]
1/30
Item
Cal. No.
6R24A
Driving system
Additional function
Crown operation
Loss/Gain
Regulation system
Number of jewels
Normal position
1st click position
2nd click position
Lift angle of the escapment
Vibration per hour
Power reserve
Time indication
• 3 hands (ho u r, mi n u te an d s e con d
hands)
• Date/Day indication
• Power reserve indicator
• Diameter Outside: Ø 27.4 mm
Casing: Ø 27.0 mm
• Height: 6.15 mm
Movement size
Automatic winding with manual winding mechanism
• 3 hands (Hour, Minute and Small Second hands)
• Calendar (day / date retrograde hands)
•
Power reserve indicator
(9 o'clock
position
)
• Retrograde day indication function
(3 o'clock
position
)
• Retrograde date indication function
(6 o'clock
position
)
• Second hand stop function
• Day / date correction function
Date setting (counterclockwise) / Day setting (clockwise)
Time setting (Hour and minute)
Manual winding (clockwise only)
28,800 (8 beats per second)
Between + 25 and - 15 seconds
Mainspring
wind up status
Testing positions
(Isochronism
fault: T24-T0)
± 10 s/d
Measurement
(daily rate in
seconds:s/d)
Dial upward:
T0 (CH)
Daily rate worn
on the wrist at
t e mp er a t ur erange between
5 °C and 35 °C)
St an d a r d r at e
for measurement
6 o’clock
at the top
Dial upward :
T24 (CH)
9 o’clock
at the top
After 24 hours
from fully wind
up
Fully wind up
± 15 s/d
31 jewels
ETACHRON system
From fully wound to stoppage: Approximately 45 hours
52 °
Second hand stop
± 10 s/d
± 15 s/d
SPECIFICATIONS
2/30
Cal. 6R24A
FEATURES
CHARACTERISTICS OF A MECHANICAL WATCH
1. This mechanical watch operates using power obtained from a mainspring.
2. While loss/gain of a quartz watch is indicated by a monthly or annual rate, accuracy of a
mechanical watch is normally indicated by a daily rate (loss/gain per day).
3. Normal usage accuracy of a mechanical watch varies according to conditions of use (time
period that the watch is worn on the wrist, temperature environment, hand movement, and
winding state of the mainspring).
4. When the watch is affected by strong magnetism, it temporarily gains or loses time. If the
watch encounters a strong magnetic field, the parts of the watch may be magnetized. In this
case, repairs such as removal of magnetism are required.
SEIKO Automatic Cal. 6R24A was developed based on the design of the Cal. 6R20A and
6R21A.
For Cal. 6R24A, its day and date indicators have been changed to the retrograde
indications.
PARTS LIST
Cal. 6R24A
3/ 30
[POWER RESERVE INDICATOR MECHANISM]
Order of disassembly: 1 71
Order of assembly: 71 1
Lubricating: Types of lubricant
Watch Oil AO-3
SEIKO Watch Grease S-6
SEIKO Watch Grease S-4
Lubricant quantity
Normal quantity
* For parts 1 , refer to page 9.
2 CALENDAR TRAIN BRIDGE
SCREW
0012201
3 CALENDAR TRAIN BRIDGE
0126032
4 POWER RESERVE INDICATOR WHEEL
1019002
5 INTERMEDIATE POWER RESERVE
INDICATOR WHEEL
0817047
6 BARREL PINION
1010267
7 INTERMEDIATE WHEEL FOR SUN AND
PLANETARY WHEEL
1026002
8 UPPER WHEEL FOR SUN AND
PLANETARY WHEEL
1009004
9 SUN AND PLANETARY WHEEL
1001025
10 LOWER WHEEL FOR SUN AND
PLANETARY WHEEL
1009003
Cal. 6R24A
PARTS LIST
4/ 30
11 DATE RESET LEVER
0585011
12 DATE INDICATOR
WHEEL
1019017
13 DATE JUMPER
0810017
14 INTERMEDIATE DATE
DRIVING WHEEL
1019007
15 DATE SETTING WHEEL
0737021
22 DATE DRIVING
WHEEL
0802038
16 CALENDAR SETTING
WHEEL UNIT
1001029
17 DAY RESET LEVER
05850120
18 DAY INDICATOR
WHEEL
1019017
19 DAY JUMPER
0873017
20 INTERMEDIATE DAY
DRIVING WHEEL
1019004
21 DAY DRIVING
WHEEL
0898004
23 CALENDAR TRAIN
PLATE SCREW
0012201
24 CALENDAR TRAIN
PLATE
0102030
25 HOUR WHEEL
0273***
26 MINUTE WHEEL
0261006
27 CANNON PINION
0225413
[CALENDAR MECHANISM]
Loading...