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Сообщение от pavel1969
Всем привет! Кто подскажет, чем отличаются калибры 6r15 с индексами А, В, С? Спасибо
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С интернета, лень переводить с англ.
Difference Between 6R15A & 6R15B
R15B uses 6 different parts compared to the 6R15A. The 6 parts are all from the new 6R20 movement used in the Premier range. Seiko decided to do this to achieve economies of scale through mainstreaming the parts for the production of both movements.
There is no quality difference between the two movements, this is merely a cost cutting exercise.
The different parts are; the barrel and train wheel bridge, the movement barrel (complete), the centre wheel & pinion, the ratchet wheel, the oscillating weight and the ratchet wheel screw.
Difference Between 6R15B & 6R15C.
1) Add one jewel on main plate, barrel hole (6R20 has that jewel already)
2) Modify ratchet sliding spring
3) Modify date indicator maintenance plate
4) New balance wheel
5) New barrel
Looked carefully, adding jewel and modify ratchet spring are all related to upgrading of barrel (to higher power reserve, so higher torque). Modify date plate is due to widely complains of date misalignment. SII upgraded balance wheel might aim to increase long term stability. The previous 6R15 all have difficulty maintain long term (1-2years) stability in accuracy.