Seiko 4205B Technical Manual

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