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(1)BASIC
(1)BASIC(1)BASIC
(1)BASIC CALIBRE
6T51 8205 8215 821A
Ligne
8-3/4
8-3/48-3/4
8-3/4
Overall diameter Φ19.8mm
Φ19.8mmΦ19.8mm
Φ19.8mm
Case fitting diameter Φ19.4mm
Φ19.4mmΦ19.4mm
Φ19.4mm
Total height 5.98mm
5.98mm5.98mm
5.98mm
Day
N/A
N/AN/A
N/A N/A
N/AN/A
N/A
Date
Jewels
(2)TIME
(2)TIME (2)TIME
(2)TIME ※Accuracy of the mechanical watch is different from the daily rate of the
quartz watch and the accuracy will change maximum of several ten seconds
during rewinding the spring, then the accuracy of the half winding condition
will be different from that if full winding condition.
Standard
StandardStandard
Standard
Time Performance 6T51 8205 8215 821A
Accuracy
Duration time 38 hours up 42 hours up
Accuracy
AccuracyAccuracy
Accuracy Measure within lapse of 10~60 minutes from full winding.
Posture difference
Posture difference Posture difference
Posture difference Measure accuracy in 4 different postures shown on the
right picture within lapse of 10~60 minutes from full winding.
※Direction of 4 postures ①Date Dial Up ②6 o'clock up ③9 o'clock up ④3 o'clock up
Duration time
Duration timeDuration time
Duration time In automatic winding, measure the operating time after winding the mainspring by the
mainspring winding up device (60 minutes) and leaving itself on natural condition
with posture.
※When setting the movement to the mainspring winding up device, set the direction of the
mainspring winding up device and the mainspring winding direction in the same direction.
※If oscillating weight makes 116.5 rotation, ratchet wheel rotates once. And when ratchet
wheel rotates 7.5 times, mainspring becomes full winded. So to full wind the mainspring,
rotating the oscillating weight for 116.5×7.5=873.75 times is needed. Check the time of
the rotation of oscillating weight on the rotation speed of below 40 rpm of the mainspring
winding up device. 60 minutes time is given considering the rotation loss.
(3)Function
(3)Function(3)Function
(3)Function ①Automatic winding and the one side mainspring winding up system
②Date,day calendar corrector function on (No calendar corrector function on the day of 6T51)
21600times/hour
21600times/hour21600times/hour
21600times/hour
28800times
28800times28800times
28800times
/hour
/hour/hour
/hour
Vibration frequency
11-1/2
11-1/211-1/2
11-1/2
Φ25.6mm
Φ25.6mmΦ25.6mm
Φ25.6mm
5.67mm
5.67mm5.67mm
5.67mm
Φ26.0mm
Φ26.0mmΦ26.0mm
Φ26.0mm
Mainspring wounding
direction
Posture difference Under 50 seconds
-20~+40 seconds/day
21 Jewels
21 Jewels21 Jewels
21 Jewels
Left rotation There is an arrow mark
Left rotation There is an arrow markLeft rotation There is an arrow mark
Left rotation There is an arrow mark
on oscillating weight block
on oscillating weight blockon oscillating weight block
on oscillating weight block
Right
RightRight
Right
rotation
rotationrotation
rotation
CALIBRE
<Measurement Condition>
<Measurement Condition><Measurement Condition>
<Measurement Condition>
PERFORMANCE
PERFORMANCEPERFORMANCE
PERFORMANCE
SPECIFICATION
SPECIFICATIONSPECIFICATION
SPECIFICATION
1


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