Page 1
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
Page 2
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.
Page 3
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
Page 4
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]
Page 5
PARTS LIST
Cal. 6R24A
5/30
[BALANCE AND ESCAPEMENT]
28 SHOCK ABSORBING SPRING
0014577
32-4 STUD SUPPORT
0345021
34 PALLET BRIDGE SCREW 0012354
35 PALLET BRIDGE 0161310
36 PALLET FORK 0301310
33 BALANCE COMPLETE
(WITH STUD)
0310048
29 SHOCK ABSORBING CAP
JEWEL 0011220
30 HOLE JEWEL
FRAME FOR
SHOCK
ABSORBER
0014295
31 BALANCE COCK SCREW
0012420
32-1 BALANCE COCK 0171116
32-2 REGULATOR 0341020
32-3 REGULATOR PIN 0033364
32 BALANCE COCK
WITH
REGULATOR
0171198
1 OSCILLATING WEIGHT
0509***
* For parts 1 , refer to page 9.
Page 6
Cal. 6R24A
PARTS LIST
6/ 30
[WINDING MECHANISM]
37 AUTOMATIC TRAIN BRIDGE SCREW (2 PCS.) 0012354
38 AUTOMATIC TRAIN BRIDGE 0191025
39 2ND REDUCTION WHEEL 0514010
40 RATCHET WHEEL SCREW 0012919
41 RATCHET WHEEL 0285051
42 BARREL AND TRAIN WHEEL BRIDGE SCREW (3PCS)
0012420
43 BARREL AND TRAIN
WHEEL BRIDGE 0112384
44 LOWER BRIDGE FOR CROWN WHEEL
AND REDUCTION WHEEL SCREW
0012354
43 PAWL LEVER
0831077
44 1ST REDUCTION
WHEEL 0511010
50 HOLD SPRING
FOR ESCAPE
WHEEL
0015703
51 CAP JEWEL
FOR ESCAPE
WHEEL
0011221
52 HOLD SPRING
FOR THIRD
WHEEL
0015703
53 CAP JEWEL
FOR THIRD
WHEEL
0011221
50
51
52
53
45 LOWER BRIDGE FOR CROWN
WHEEL AND REDUCTION WHEEL
0436164
46 1ST REDUCTION WHEEL
HOLDER 0836002
49 SLIDING CROWN WHEEL
SPRING 0363156
Page 7
PARTS LIST
Cal. 6R24A
7/30
[GEAR TRAIN MECHANISM]
55 THIRD WHEEL 0231070
56 CENTER WHEEL BRIDGE
SCREW 0012354
57 CENTER WHEEL BRIDGE
0122302
58 ESCAPE WHEEL 0251310
59 CLICK 0381004
60 BARREL COMPLETE 0201074
54 FOURTH WHEEL 0241***
61 CENTER WHEEL 0221***
* For parts
54 and 61
, refer to page 9.
Page 8
Cal. 6R24A
PARTS LIST
8/ 30
[SETTING MECHANISM]
62 SETTING LEVER JUMPER SCREW
(2PCS.) 0012168
* For parts 67 , refer to page 10.
64 YOKE 0384061
65 SETTING LEVER 0383060
66 STOP LEVER 0601310
67 WINDING STEM
0351200
68 CALENDAR CORRECTOR 1ST
INTERMEDIATE WHEEL 0962164
63 SETTING LEVER JUMPER
0388177
70 CLUTCH WHEEL
0282040
69 WINDING PINION
0283020
71 MAIN PLATE 0100495
Page 9
PARTS LIST
Cal. 6R24A
9/30
Following parts are determined based on the design of watches, such as hands height, dial color,
and design of cases. Please refer to the SEIKO WATCH PARTS CATALOGUE in order to choose
corresponding parts.
1
OSCILLATING WEIGHT
0509290
0509291 (for ANANTA)
67 WINDING STEM 0351200
For screw down crown models, the stem is assembled to the crown and is not available
separatelly.
25 HOUR WHEEL 0273***
54
FOURTH WHEEL 0241***
61 CENTER WHEEL 0221***
Please refer to the following table in order to find the correct part number of each wheel according
to the hand installation height. The numeral 2 or 3 is printed on the DIAL.
●
How to find the correct parts, if not determined by 4 digit caliber number
25 HOUR WHEEL 54 FOURTH WHEEL 61 CENTER WHEEL
2 0273029 0247216 0221085
Example :
6R21-00C0 T2
Hand installation height
Page 10
Cal. 6R24A
PARTS LIST
10/ 30
0012 919
0012 354
40 RATCHET WHEEL SCREW
34 PALLET BRIDGE SCREW (2 pcs)
37 AUTOMATIC TRAIN BRIDGE SCREW (2 pcs)
44 LOWER BRIDGE FOR CROWN WHEEL AND REDUCTION WHEEL
SCREW
56 CENTER WHEEL BRIDGE SCREW
Parts code
Parts name
62 SETTING LEVER JUMPER SCREW (2 pcs)
31 BALANCE COCK SCREW
42 BARREL AND TRAIN WHEEL BRIDGE SCREW (3 pcs)
CASING CLAMP SCREW (2 pcs)
0012 168
0012 420
0012 067
CROSS-SECTION VIEW OF THE SCREW PARTS
0012 201
2 CALENDAR TRAIN BRIDGE SCREW (4 pcs)
23 CALENDAR TRAIN PLATE SCREW
Page 11
PARTS LIST
Cal. 6R24A
11/30
Upper
55 THIRD WHEEL
54 FOURTH WHEEL
Cap jewel
Hole jewel
Cap jewel
Hole jewel
GEAR TRAIN
MECHANISM
39 2ND REDUCTION
WHEEL
58 ESCAPE WHEEL
60 BARREL COMPLETE
(WITH MAINSPRING)
61 CENTER WHEEL
CROWN WHEEL
(Assembled to the
43 BARREL AND
TRAIN WHEEL BRIDGE)
12 SUN WHEEL
48 1ST REDUCTION WHEEL
36 PALLET FORK
7 PLANETARY REDUCTION
WHEEL
14 DATE WHEEL
33 BALANCE COMPLETE
(WITH STUD)
ENTRY PALLET JEWEL
EXIT PALLET JEWEL
ROLLER JEWEL
Lower
WINDING
MECHANISM
POWER RESERVE
INDICATOR /
CALENDAR UNIT
BALANCE AND
ESCAPEMENT
TOTAL NUMBER OF JEWELS
31 jewels
15 DATE DRIVING
REDUCTION WHEEL
9 DAY WHEEL
●
Location of the jewels
Page 12
Cal. 6R24A
PARTS LIST
12/30
●
Tools and consumables required for disassembling/reassembling
• Movement holder
UNIVERSAL MOVEMENT HOLDER
(S-682)
• Watch oils
SEIKO watch grease S-6 and S-4. watch oil AO-3 (or Moebius A)
S-6
AO-3
S-4
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