Seiko 4R57A Quick start guide
PARTS LIST / TECHNICAL GUIDE
Automatic Cal.4R57A
Driving system Automatic winding with manual winding mechanism
Additional function ・Date correction function
・Second hand stop function
Crown Manual winding (Clockwise only)
operation Date setting (Counterclockwise only)
Time setting (Hour and minute)
Vibration per hour 21,600 vibrations
Daily Rate
Between ＋45 ～ －35 seconds
(Between 5℃ and 35℃)
Loss/Gain
Instantaneous rate at T0 Isochronous fault
（Fully would condition)
Standard rate
Testing positions Dial upward 6 o'clock at 9 o'clock at Dial upward
for measurement
the top the top
Measurement
（Daily rate in +25 s/d +35 s/d +35 s/d ±30 s/d
seconds：s/d） -15 s/d -25 s/d -25 s/d
Regulation system ETACHRON system
Lift angle of the escapement 53°
Continuous operating time From fully wound to stoppage ： approximately 41 hours
Jewels 29 jewels
1/14
Cal. No.
Normal position
Item
4R57A
2nd click
1st click
・3 Hands (Hour, Minute, Second)
・Date calendar Hand
・Power reserve indicator
Movement Size
・Outside diameter: Ф29.36mm
・Height：6.63 mm
Disassembling procedures Figs. →
Reassembling procedures Figs. →
0439 190
Dial spacer
4408 245
Dial holding spacer
0012 310
Auxiliary train wheel
bridge screw
0126 190
Auxiliary train wheel bridge
0538 001
Barrel arbor pinion
0817 047
Intermediate power reserve wheel 1026 002
Planetary reduction wheel
1009 004
Second sun wheel
1001 025
1019 190 Sun and planet unit
Center power reserve wheel
1009 003
0817 190 Sun wheel
Intermediate center power reserve wheel
0491 190
Dial washer
・Refer to the page9 for the
oiling position.
2/14
PARTS LIST
*2
Cal.4R57A
8
9
10
11
4
7
6
2
3
(Back side)
5
12
13
14
*1
*1
*2
Type of oil Oil quantity mark
S-6 NORMAL QUANTITY
S-4 SUFFICIENT QUANTITY
AO-3 (Moebius A)
61
61
1
1
0970 102
Date star
1001 128
0802 036 Date corrector setting unit
Date driving wheel
0810 164
Date jumper
0737 021
Date corrector setting wheel
0012 310
Auxiliary main plate screw
0102 190
Auxiliary main plate
0273 245
Hour wheel
0261 183
Lower shock absorbing spring Minute wheel and pinion
0225 438
Lower shock absorbing jewel Cannon pinion
0962 190
Lower hole jewel
for shock-absorber
3/14
16
15
17
Cal.4R57A
(Back side)
18
PARTS LIST
Date corrector setting
transmission wheel B
62-1
62-2
(Back side)
19
20
21
22
23
62-3
24
25
*4
*1
*2
*1
*4
*2
*3
*3
Type of oil Oil quantity mark
S-6 NORMAL QUANTITY
S-4 SUFFICIENT QUANTITY
AO-3 (Moebius A)
Oscillating weight
・Refer to page 7 for each parts code
・Refer to the page11 for
assembling position
0012 354
0012 420 0191 183
Balance cock screw Automatic train bridge
0171 354 0514 183
Balance cock
0012 919
Ratchet wheel screw
0285 051
Ratchet wheel
0012 354
Pallet bridge screw
0161 300
0310 185 Pallet bridge
Balance complete
with stud 0301 009
Pallet fork
Upper shock absorbing spring
Upper hole jewel for shock-absorber
4/14
Automatic train bridge screw
32-1
35
Upper shock absorbing jewel
PARTS LIST
Cal.4R57A
30
33
34
1
32-3
29
26
31 27
32-2
Second reduction wheel and pinion
32 28
32-4
*2
*3
*1
whole tooth
*1
*2
*3
Type of oil Oil quantity mark
AO-3 (Moebius A) S-6 NORMAL QUANTITY
S-4 SUFFICIENT QUANTITY
0012 420
0511 010 Cap jeweled spring
First reduction wheel
・Refer to page 8 for the oiling position Cap jewel
・Refer to page 10 for
Disassembling/Reassembling
0831 183 0363 184
Pawl lever
・Refer to the page11 for assembling
0114 183
Barrel and train wheel bridge
・Refer to page 8 for the oiling position
0836 002
Reduction wheel holder
0436 166
Lower plate for barrel and train
wheel bridge
0012 354
0144 245 Lower plate for barrel and train
Fourth wheel and pinion wheel bridge screw
0231 070
Third wheel and pinion
0012 354
Center wheel bridge screw
0122 164
Center wheel bridge
5/14
42
Ratchet sliding wheel spring
47
44
46
43
37
45
37-1
38
39
37-2
PARTS LIST
Barrel and train wheel bridge screw
40
Cal.4R57A
36
*1
*1
Type of oil Oil quantity mark
S-6 NORMAL QUANTITY
S-4 SUFFICIENT QUANTITY
AO-3 (Moebius A)
41
0224 438
Center wheel with cannon pinion
0381 004
Click
0201 287
Barrel complete
0251 300
Escape wheel and pinion 0012 168
Yoke spring screw
0388 177
Yoke spring
0384 183
Yoke
0383 185
0601 183 Setting lever
Stop lever
・Refer to page 9 for
the oiling position 0282 183
Clutch wheel
0283 020
Winding pinion
0962 183
Date corrector setting
transmission wheel A
0351 200
Winding stem
Main plate
6/14
55
61
52
56
59
60
53
57
58
51
54
Cal.4R57A
48
49
50
PARTS LIST
*1
*3
*1
*3
*4
*4
*2
*2
Type of oil Oil quantity mark
S-6 NORMAL QUANTITY
S-4 SUFFICIENT QUANTITY
AO-3 (Moebius A)
Oscillating weight with ball bearing
●
List of screws
*All parts code are subject to change without notice.
7/14
Cal.4R57A
31
Lower plate for
barrel and train
wheel bridge screw
26
Auxiliary train wheel
bridge screw (×4)
Balance bridge
screw
Pallet bridge screw
(×2)
PARTS LIST
42
Barrel and train
wheel bridge screw
(×3)
Automatic train
bridge screw (×2)
33
0012 100
Parts No
46
Name
0012 354
0012 919 Center wheel bridge
screw
Name Parts No
29 Ratchet wheel screw
1509 194
25
Parts code Marking
1509 193 Japan mark
0012 168
36
Yoke spring screw
(×2)
52
Auxiliary main plate
screw
20
4
0012 310
1.Oiling spot
Barrel and train wheel bridge
[Top side]
[Back side]
Note：
After oiling *2 , set Lower plate for barrel and train wheel bridge & screw.
Lower plate for barrel and train wheel bridge
Lower plate for barrel and train wheel bridge screw
After oiling *4 , set First reduction wheel & Pawl lever & Reduction wheel holder.
First reduction wheel
First reduction wheel
Pawl lever
Reduction wheel holder
8/14
Cal.4R57A
TECHNICAL GUIDE
39
43
42
(1)
41
41
40
37
*1
*1
*2
*3
*2 *3
*4
Type of oil Oil quantity mark
S-6 NORMAL QUANTITY
S-4 SUFFICIENT QUANTITY
*4
AO-3 (Moebius A)
Planet unit
Second sun wheel
Notes:
*2 Oil to between the Arbor pinion and the Gear.
Sun and planet unit
Sun wheel
Stop lever
Stop lever
Main plate
Contact part of Main plate and Stop lever
9/14
10
11
(3)
56
61
TECHNICAL GUIDE
Cal.4R57A
9
(2)
*2
Type of oil Oil quantity mark
S-6 NORMAL QUANTITY
S-4 SUFFICIENT QUANTITY
AO-3 (Moebius A)
2. Disassembling / Reassembling of the First reduction wheel
First reduction wheel
Reduction wheel holder
Barrel and train wheel bridge (back side)
3. Disassembling / Reassembling of the Cannon pinion
Cannon pinion
10/14
UP
24
<< Disassembling >>
Cal.4R57A
Push
<< Reassembling >>
TECHNICAL GUIDE
39
37
<< Disassembling >> << Reassembling >>
41
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