6R15 的機芯有 3 種, 6R15A、6R15B 同 6R15C
Late 2005 – 6R15A introduced, based on the 7S with Etachron regulator and Spron 510 mainspring.
Late 2006 – 6R15B introduced – new parts:
- the barrel and train wheel bridge
- the movement barrel (complete)
- the centre wheel and pinion
- the ratchet wheel
the oscillating weight
- the ratchet wheel screw
Late 2011 – 6R15C introduced – changes:
- modified ratchet sliding spring
- modified date indicator maintenance plate
- new balance wheel
- new barrel
Original Article: http://watcharama.com/the-seiko-4r36-family-in-brief/
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