Seiko 6R24A Quick start guide

PARTS LIST/TECHNICALGUIDE

Automatic Cal. 6R24A

[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 (hour, minute and se c ond

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 m p e r a t u r e -

range between

5 °C and 35 °C)

S t a n d a r d r a t 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

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]

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 REGULATOR0341020

32-3 REGULATOR PIN 0033364

32 BALANCE COCK

WITH

REGULATOR

0171198

1 OSCILLATING WEIGHT

0509***

*For parts 1 , refer to page 9.

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

45 LOWER BRIDGE FOR CROWN

WHEEL AND REDUCTION WHEEL

0436164

46 1ST REDUCTION WHEEL

HOLDER 0836002

49 SLIDING CROWN WHEEL

SPRING 0363156

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.

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

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.

1OSCILLATING 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

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

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