Citizen 0S2A Instruction Manual Download Page 2

2. SEPARATED PARTS

Setting stem x1 

Code

065-453

Length from movement center to far end 

23.00mm

of setting stem
Thread.................................

Ф

0.9mm x 8.50mm

3. OTHERS

* Measurement of time rate

The unit(gate) time of measurement must be set at "10 sec." or integer fold
value of 10 sec. owing to the DFC system, and the measurement must be
performed in the form of complete watch.

* Marking on movement

JAPAN

MIYOTA CO.

0S2A

NO JEWELS

* Typical clearance

Mov't - Caseback

minimum 150 microns

Top of hands - Glass

300 - 400 microns *

* subject to the glass,  case structure, and the length of hand

* Note

 

Please use aluminum material hand for Chrono second hand

* TACHYMETER

The tachymeter is the device which measures the speed of an automobile. Knowing is how 
many seconds the car covers a distance of 1km, the meter can measure the approximate  
average speed per hour during a journey (up to the maximum measurable range of 
tachymeter is 60 seconds.)
If the chronograph is started at the same time as measurement, and stopped after 1 km,
the average speed per hour can be determined according to the position of the second 
hand. If the car covers the distance of 1km in 45second, the average hourly speed during 
the journey will be about 80 km.

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