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· Researcher
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The 7S26B movement also incorporates a new barrel/mainspring assembly (part # 0201 075), a different setting lever/yoke spring (part# 0388 177)-same as 6R15 , and as mentioned above a new balance wheel (part# 0311 050)-same as 6R15. I am not sure of the differences between 6R15A and B movements. Information taken from 7S26A Seiko tech pdf and NH26 NE15 TMI tech pdf.
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