Seiko 4205B Quick start guide

PARTS CATALOGUE /TECHNICAL GUIDE

Cal. 4205B / 4206B / 4207B

4208B / 4225A / 4227A

Movement

Time indication

Outside diameter ø17.5 mm

Casing diameterMovement size ø17.2 mm

Height 5.6 mm

Three hands (Hour, minute and second hands)

Vibrations per hour 21,600 (6 beats per second)

Additional

mechanism

Automatic winding

Jewels 17 jewels 21 jewels

The illustrations refer to Cal. 4206B (x 2.0)

4227A4207B4205B

Cal. No.

Item

[SPECIFICATIONS]

Date calendar

Day and date calendar

Instant calendar (date)

setting device

Instant calendar (day

and date) setting device

4206B 4225A

4208B

ø23.8 mm

ø23.4 mm

5.6 mm

Auxiliary hand winding

mechanism

17 jewels 21 jewels 21 jewels 21 jewels

PARTS CATALOGUE

30 0310 421

Balance complete

with stud

28 0012 123

Stud screw

29 0171 426

Balance cock

27 0012 484

Balance cock screw

Diashock

26 0505 421

Transmission wheel

and pinion

25 0831 421

Pawl lever with jewel

23 0012 485

Framework for automatic

device screw

Disassembling procedures Figs. : 1 ~ 61

Reassembling procedures Figs. : 61 ~ 1

Lubricating: Type of oil Oil quantity

Moebius A or AO-32Liberal quantity

SEIKO Watch Oil S-4 Normal quantity

SEIKO Watch Oil S-6 Extremely small

20 Cannon pinion

19 0802 422

Date driving wheel

18 0817 421

Intermediate date driving

wheel and pinion

17 0261 422

Minute wheel

16 Hour wheel

15 0972 423

Day-date corrector finger

14 0810 420

Date jumper

13 0811 420

Date jumper spring

12 Date dial

11 0808 423

Date dial guard

10 0873 422

Day jumper

9 0012 485

Date dial guard screw

8 0012 797

Day jumper screw

7 0556 422

Date finger

6 0012 485

Date driving wheel

screw

5 Day star with dial disk

3 Holding ring for dial

2 Dial

1 Hour, minute and

second hands

21 0012 488

Oscillating weight

without pinion screw

Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A

4 0963 420

Snap for day star with

dial disk

22 0500 424

Oscillating weight

24 0193 420

Framework for automatic

device with ball bearing

Ex.: Cal. 4206B

33 0301 422

Jewelled pallet fork

and staff

32 0161 420

Pallet cock

31 0012 485

Pallet cock screw

Please see the remarks on the following pages.

➡➡

PARTS CATALOGUE

61 Main plate

0100 421 (4205B/4206B)

0100 423 (4207B/4208B)

0100 430 (4225A/4227A)

Diashock

60 Winding stem

59 0283 421

Winding pinion

58 0282 422

Clutch wheel

57 0390 420

Setting lever axle

56 0383 420

Setting lever

55 0384 420

Yoke

54 0388 421

Setting lever

spring

53 0012 484

Setting lever

spring screw

Dial leg pin

51 0251 421

Escape wheel and

pinion

50 0121 420

Center wheel bridge

0540 421

Dial leg holder

49 0012 485

Center wheel

bridge screw

48 0105 420

Lower plate for

balance cock

47 0542 421

Locking seat for idle

wheel

45 0363 420

Sliding crown

wheel spring

46 0237 421

Intermediate

ratchet wheel

44 0012 484

Screw for locking

seat for idle wheel

43 0241 421

Fourth wheel and

pinion

41 Second wheel

pinion

42 0231 421

Third wheel and

pinion

40 0201 420

Complete barrel

with mainspring

39 0285 420

Ratchet wheel

38 0381 420

Click

37 0112 430 (Cal. 4205B, 4206B)

0112 432 (Cal. 4207B, 4208B, 4225A, 4227A)

Barrel and train wheel bridge

36 0396 420

Friction spring for second

wheel pinion

34 0012 485

Barrel and train wheel bridge

screw (B)

35 0012 484

Barrel and train wheel bridge

screw (A)

52 Center wheel with

cannon pinion

➡➡Please see the remarks on the following pages.

Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A

PARTS CATALOGUE

0012 484

0012 123

• Stud screw

Name

Part No.

•List of screws

0012 797

0012 488

• Oscillating weight with-

out pinion screw

Part No. Name

•List of jewels

Name

0011 333 • Upper hole jewel for third wheel

and pinion

0011 212 • Diashock upper cap jewel

• Diashock lower cap jewel

Part No.

0011 713 • Lower hole jewel for second wheel

and pinion

0011 541 • Upper hole jewel for fourth wheel

and pinion

Name

Part No.

• Center wheel bridge

screw

• Pallet cock screw

• Framework for automatic

device screw

• Date driving wheel screw

• Date dial guard screw

• Barrel and train wheel

bridge screw (B)

0012 485

0011 752 • Upper hole jewel for center wheel

and pinion

• Lower hole jewel for center wheel

and pinion

0011 528 • Upper hole jewel for escape wheel

and pinion

• Lower hole jewel for escape wheel

and pinion

0011 505 • Upper hole jewel for jewelled pallet

fork and staff

• Lower hole jewel for jewelled pallet

fork and staff

• Barrel and train wheel

bridge screw (A)

• Balance cock screw

• Setting lever spring screw

• Screw for locking seat for

idle wheel

• Day jumper screw

Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A

* Cal. 4205B has two more date dial guard screws

instead of the day jumper screw.

* Cal. 4207B also has the following parts

0011 333 Lower hole jewel for third wheel and pinion

0011 584 Lower hole jewel for fourth wheel and pinion

0011 751 Upper hole jewel for complete barrel with mainspring

•List of tubes

Part No. Name

PARTS CATALOGUE

0017 255 • Tube for center wheel bridge (B)

0017 259 • Tube for date dial guard (B)

0032 422 • Tube for pallet cock (B)

0032 421 • Tube for balance cock

0017 257 • Tube for date dial guard (A)

0032 420 • Tube for barrel and train wheel

bridge (A)

Part No. Name

0032 423 • Tube for locking seat for idle wheel

0032 424 • Tube for date driving wheel

0032 425 • Tube for barrel and train wheel

bridge (B)

0033 422 • Dial leg holder pin

0033 421 • Dial leg pin

* The type of holding ring for dial is determined based on the design of cases and dials. Check the

case number and refer to “SEIKO Watch Parts Catalogue CD-ROM” to choose a corresponding

holding ring for dial.

Remarks

3 Holding ring for dial

•Other parts

0341 432 • Regulator

Part No. Name

0014 414 • Diashock lower frame

0014 413 • Diashock upper frame

0014 417 • Diashock upper spring

• Diashock lower spring

Part No. Name

0014 415 • Diashock upper hole jewel with

frame

• Diashock lower hole jewel with

frame

0315 420 • Balance staff

0331 420 • Roller with jewel

0345 420 • Stud holder

5 Day star with dial disk

* If any type of day star with dial disk is required, specify the number printed on the disk.

12 Date dial

* The type of date dial is determined based on the design of cases. Check the case number and

refer to “SEIKO Watch Parts Catalogue CD-ROM” to choose a corresponding date dial.

Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A

PARTS CATALOGUE

16 Hour wheel

20 Cannon pinion

41 Second wheel pinion

52 Center wheel and pinion

Combination:

Type Cannon pinion Hour wheel

Second wheel

pinion

0271 427

0271 425

0225 427

0225 422

0245 427

0245 421

0224 421

0224 427

60 Winding stem 0351 420

* The type of winding stem is determined based on the design of cases. Check the case number

and refer to “SEIKO Watch Parts Catalogue CD-ROM” to choose a corresponding winding stem.

Center wheel and pinion

0271 426

0225 4230245 422 0224 422

Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A

TECHNICAL GUIDE

•The explanation here is only for the particular points of the calibres equipped with the day star with dial

disk and date dial.

11 Date dial guard

Set the protruding portion of the day-date corrector finger into the hole of the date dial guard (A

portion).

A portion of the date dial guard

Protruding portion of the day-date corrector finger

25 Pawl lever with jewel

If a tip of the pawl lever is on the top of the transmission wheel and pinion, insert something with a

sharpened tip through the hole of the framework for automatic device with ball bearing, and move

the tip of the pawl lever sideways so that the lever and the transmission wheel and pinion properly

engage each other.

Pawl lever with jewel

Hole of the framework for automatic device with ball

bearing

26 Transmission wheel and pinion

•Lubricating

45 Sliding crown wheel spring

When setting the sliding crown wheel spring, check that it engages the teeth of the sliding crown wheel.

Sliding crown wheel spring

Sliding crown wheel

(fixed to the locking seat for idle wheel)

Locking seat for idle wheel

Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A

47 Locking seat for idle wheel

•Lubricating

Sliding crown wheel

Locking seat for idle wheel

2005-05

TECHNICAL GUIDE

15 Day-date corrector finger

14 Date jumper

13 Date jumper spring

56 Setting lever

55 Yoke

•Setting position

Day-date corrector finger

Setting lever

Yoke

Date jumper spring

Date jumper

Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A

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