SEIKO Automatic Open-heart Cal 4R38A and 4R39A have been developed based on the Cal 4R36A Following parts are determined based on the design of watches, such as hands height, dial color, and design of cases (4R39 only)
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SEIKO Automatic Open-heart Cal 4R38A and 4R39A have been developed based on the Cal 4R36A Following parts are determined based on the design of watches, such as hands height, dial color, and design of cases (4R39 only)
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PARTS LIST / TECHNICAL GUIDE
4R38A/4R39A
4R38A4R39A
Movement size
Outside diameterØ 27.4 mmØ 27.4 mm
Casing diameterØ 27.0 mmØ 27.0 mm
Height5.32 mm5.32 mm
Driving systemAutomatic winding with manual winding mechanismTime indication
Hour, Minute, and Small second hands)
(Hour, Minute, and Second hands)Additional function
Crown operationVibration per hourMovement size
Outside:
Ø 27.4 mm
Casing:
Ø 27.0 mm
hour, minute and second hands)Automatic Open-heart Cal. 4R38A/4R39A
[SPECIFICATIONS] ItemCal. No.
Loss/Gain
t he wrist at range between 5 °C and35 °C)Between +45 and -35 seconds
m easurementT0 (CH)
T24 (CH)
Measurement
se conds: s/d)± 20 s/d± 30 s/d± 30 s/d(Isochronism
± 3
0 s/dRegulation system
Lift angle of the escapement53 °
Power reserve
Number of jewels24 jewels (the figures below are Cal. 4R39A.)Cal. 4R38A/4R39A
PARTS LIST
2/20 SeiKO Automatic Open-heart Cal.4R38A and 4R39A have been developed based on the Cal.4R36A. the movement is both automatic and hand-winding with a power reserve of 41 hours. t he heart of the movement with its gold plated balance wheel is visible through the dial at the nine o'clock position, and the whole movement, with its specially engraved rotor, can be seen through the see-through case back. the three time-of-day hands are complemented by a 24-hour hand set into a subdial at the 11 o'clock position (Cal. 4R39A only).Fea tURes
Ch aRaCteRistiCs oF a meChaniCal WatCh
1. th is mechanical watch operates using power obtained from a mainspring.
2. W hile loss/gain of a quartz watch is indicated by a monthly or annual rate, accuracy of a m echanical watch is normally indicated by a daily rate (loss/gain per day). 3. N ormal usage accuracy of a mechanical watch varies according to conditions of use (time p eriod that the watch is worn on the wrist, temperature environment, hand movement, and w inding state of the mainspring). 4. W hen the watch is affected by strong magnetism, it temporarily gains or loses time. if the w atch encounters a strong magnetic field, the parts of the watch may be magnetized. in this c ase, repairs such as removal of magnetism are required.Cal. 4R38A/4R39A
PARTS LIST
3/20ˠPlease refer to the following pages.
Lubricating:
types of oil Oil quantityAO-3 (Moebius A)
Liberal quantity
SeiKO Watch Oil S-6 Normal quantity
SeiKO Watch Oil S-4
Disassembling procedures Figs. : 1 45
Reassembling procedures Figs. : 45 1
[TRAIN WHEEL MECHANISM]2 hoUR Wheel gUaRd sCReW
0012354
3 hoUR W h eel gUaRd0376184
4 hoUR W h eel0273183 (
C al.4 R 38a
0273185 (
C al.4 R 39a 5 inteRmed i ate 24 h oUR W h eel and P i n i on
0817300 (
C al.4 R 39a onlY) 6 24
h oUR W h eel
0157184(
C al.4 R 39a onlY) 7 mi nUte W h eel and P i n i on
0261183
8 C annon P i n i on0225 414 (
C al.4 R 38a
0225 417 (
C al.4 R 39a di sassemble a FteR C enteR Wh eel)
9 dial holding sPaCeR
4408***
loWeR shoCk absoRb i ng sPR i ng loWeR s h oCk absoRb i ng CaP JeWel loWeR h ole JeWel FRame FoR s h oCk-absoRbeR0014 5770011 220
0014 295
16-6 16-5 16-7 *1 *2*2 *1Cal. 4R38A/4R39A
PARTS LIST
4/20ˠPlease refer to the following pages.
L ubricating: t ypes of oil AO-3 (Moebius A)
S eiKO Watch Oil S-6 S eiKO Watch Oil S-4 [BALANCE AND ESCAPEMENT]15 balanCe bRidge
sCReW0012 420
balanCeComPlete W
i t h stUd0310 198
UPPeR s
h oCk absoRb i ng sPR i ng UPPeR h ole JeWelFRame FoR s
h oCk- absoRbeRUPPeR s h oCk absoRb i ng CaPJeWel11
aUtomatiC tRain bRidge0191 183
12 seCond RedUCt i on W h eel and P i n i on0514 183
13 Ra tC h et W h eel sCReW0012 919
14 Ra tC h et Weel0285 051
17 P allet bR i dge sCReW0012 354
18 P allet bR i dge0161 300
19 P allet FoRk0301 00910
aUtomatiC tRain bRidge sCReW0012 354
11 osCillating Weight With ball beaRing
R efer to se i ko W eb P arts C atalogue.0509***
16 balanCe CoCk0171 353
16-2 16-3 16-4 16-1 *1*1 *2 *2 *3 *3Cal. 4R38A/4R39A
PARTS LIST
5/20ˠPlease refer to the following pages.
Lubricating:
types of oilAO-3 (Moebius A)
SeiKO Watch Oil S-6
SeiKO Watch Oil S-4
[WINDING MECHANISM]20 baRRel and tRain
W h eel bR i dge sCReW0012 420
CaP JeWelled sPR
i ng0015 703
CaP JeWel
0011 221
23sl i d i ng
CRoWn W
h eel sPR i ng0363 183
22baRRel and tRa i n W h eel bR i dge W i t h h ole JeWel FRame
0114 183
27loWeR Pla te FoR baRRel and tRa i n W h eel bR i gde
0436 164
30t hi Rd W h eel and P i n i on