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Parts Catalogue / TECHNICAL GUIDE
[SPECIFICATIONS]
Item
Movement
Movement size
Time indication
Vibrations per hour
Automatic winding
Additional
Auxiliary hand winding
mechanism
mechanism
Date calendar
Day and date calendar
Instant calendar (date)
setting device
Instant calendar (day
and date) setting device
Jewels
Cal. 4205B / 4206B / 4207B
4208B / 4225A / 4227A
Cal. No.
Outside diameter
ø17.5 mm
Casing diameter
ø17.2 mm
Height
5.6 mm
Three hands (Hour, minute and second hands)
21,600 (6 beats per second)
17 jewels
4208B
4205B
The illustrations refer to Cal. 4206B
21 jewels
4206B
4207B
17 jewels
21 jewels
4225A
4227A
(x 2.0)
ø23.8 mm
ø23.4 mm
5.6 mm
21 jewels
21 jewels
1
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Summary of Contents for Seiko 4205B
- Page 1 PARTS CATALOGUE / TECHNICAL GUIDE Cal. 4205B / 4206B / 4207B 4208B / 4225A / 4227A [SPECIFICATIONS] Cal. No. 4208B 4205B 4206B 4207B 4225A 4227A Item Movement The illustrations refer to Cal. 4206B (x 2.0) ø23.8 mm Outside diameter ø17.5 mm ø23.4 mm...
- Page 2 PARTS CATALOGUE Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A Disassembling procedures Figs. : Ex.: Cal. 4206B Reassembling procedures Figs. : Lubricating: Type of oil Oil quantity Moebius A or AO-32 Liberal quantity SEIKO Watch Oil S-4 Normal quantity SEIKO Watch Oil S-6...
- Page 3 PARTS CATALOGUE Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A 0012 485 Barrel and train wheel bridge screw (B) 0012 484 Barrel and train wheel bridge screw (A) 0396 420 Friction spring for second wheel pinion 0112 430 (Cal. 4205B, 4206B) 0112 432 (Cal.
- Page 4 0012 484 0012 797 • C e n t e r w h e e l b r i d g e * Cal. 4205B has two more date dial guard screws screw instead of the day jumper screw. • Pallet cock screw •...
- Page 5 Holding ring for dial * 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.
- Page 6 0271 426 0224 422 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.
- Page 7 TECHNICAL GUIDE Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A • 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).
- Page 8 TECHNICAL GUIDE Cal. 4205B, 4206B, 4207B, 4208B, 4225A, 4227A 47 Locking seat for idle wheel • Lubricating Sliding crown wheel Locking seat for idle wheel 13 Date jumper spring 14 Date jumper 15 Day-date corrector finger 55 Yoke 56 Setting lever •...
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