Seiko 1B21 - Specifications

The radio signal transmitting station can be switched by changing the time
difference. When the time difference is set to a region outside the radio signal
receivable area, the radio signal reception function will not work.
* To set the Daylight Saving Time (DST), set the seconds hand to point at the time difference index next to the
target time zone in the clockwise direction (+1 hour).
BP
C
JJY
BPC
JJY
1 1
In Japan In China In the other countries
Set to the 9-second
position
Set to the 8-second
position
“List of time zone
differences in major
regions of the world”
→ P.35
* When the seconds hand is at 13 seconds (UTC +13 hours), press the button to move it to the 49-second
position (UTC -11 hours).
One minute after the hour and minute hands stop after the operation 6, the watch exits the
time difference setting mode.
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TROUBLESHOOTING
■ Set the time and date
7
Receive a radio signal to set the time and date
When the operations 1 - 6 are finished, make sure to set the time and date.
* 1B22 / 1B32 are the only models requiring date adjustment.
“How to conduct manual reception” → P.60
Set the time and date manually in an environment in which a radio signal cannot be received.
“How to manually set the time (1B21: non date-displaying model)” → P.63
“How to manually set the time (1B22 / 1B32: date-displaying models)” → P.66
“How to manually set the date (1B22 / 1B32: date-displaying models)” → P.69
When the time and date are set, the operations are finished.
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Specifications
Cal. 1B21 1B22 / 1B32
1. Features Basic watch with three hands (Hour, minute
and seconds hands)
Basic watch with three hands (Hour, minute
and seconds hands), date display
2. Frequency of crystal
oscillator
32,768 Hz (Hz= Hertz, cycles per second)
3. Loss/gain (Monthly
rate)
Loss/gain ±15 seconds in a monthly rate (Except the cases when the watch is used
without time adjustment by receiving a radio signal and when it is worn on the wrist within
a normal temperature range between 5 °C and 35 °C)
4. Operational
temperature range
Between −10 °C and +60 °C
5. Driving system Step motor type (Hour, minute and seconds
hands)
Step motor type (Hour, minute and seconds
hands and the date)
6. Power source Secondary battery, 1 piece
7. Duration Approximately 6 months (when the battery is fully charged and the power save is not
activated)
* Approximately one year and a half at maximum when the power save is activated after the
battery is fully charged.
8. Radio signal reception
function / radio signal
transmitting station
Japan (2 stations), China, U.S.A. and Germany.
Automatic reception (Before 2:00 a.m. and 4:00 a.m.)
* It varies depending on the radio signal receiving condition.
* After radio signal reception, the watch will start to work depending on the quartz movement
until the next reception.
* Manual reception is available.
9. Integrated circuit Oscillator, frequency divider, drive and reception circuit: IC, 2 pieces
* The specifications are subject to change without prior notice due to product improvements.
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SPECIFICATIONS