PARTS LIST / TECHNICAL GUIDE
Automatic Cal.
4R15A/4R15B/4R16A/4R16B
[SPECIFICATIONS]
1/19
Item
Cal. No.
4R15A/4R15B/4R16A/4R16B
22 jewels
Automatic winding
Between -35 and +45 seconds
Automatic winding function
* Day and date correction function
*Day and date correction
Time setting (Hour and minute)
Free
• Diameter
Outside: Ø 27.4 mm
Casing: Ø 27.0 mm
• Height:
5.25 mm
• 3 hands (hour, minute,
and second hands)
• Calendar (Date: Date disk)
(Day: Day disk)
21,600 (6 beats per second)
Mainspring
wind up status
Testing positions
(Isochronism
fault: T24-T0)
± 30 s/d
Measurement
(daily rate in
seconds:s/d)
Dial upward:
T0 (CH)
± 30 s/d
ETACHRON system
From fully wound to stoppage: Approximately 50 hours
* Cal. 4R15A/B has only date but without day. Descriptions related to day display and day correction are
only applicable for Cal. 4R16A/B.
Movement
[Bridge side]
[Calendar side]
Movement size
53 °
Daily rate worn
on the wrist at
t e m p e r a t u r e
range between
5 °C and 35 °C)
Standard rate
f o r m e a s u r e -
ment
6 o’clock
at the top
Dialupward :
T24 (CH)
9 o’clock
at the top
After 24 hours
from fully wind
up
Fully wind up
± 20 s/d
± 30 s/d
Driving system
Additional function
Crown operation
Loss/Gain
Regulation system
Number of jewels
Normal position
1st click position
2nd click position
Lift angle of the escapment
Vibration per hour
Continuous operating time
