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Compared to 6R15C and 6R15B

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There are five improvements to 6R15C with 6R15B movement.


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."

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