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  1. #1
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    Recently upgraded 6R15C/NE15B

    As Jake mentioned last time, SII has upgraded popular 6R15B movement to 6R15C. If you use TMI products, that's NE15 to NE15B. The upgrade includes:

    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.
    jason_recliner and CitizenM like this.

  2. #2
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    Re: Recently upgraded 6R15C/NE15B

    Good to know. Thanks
    6309-7049 / SQ 7049 Hybrid / 7n42-6139 / 6602-8050 / SARB017 / 6139-6002

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    Re: Recently upgraded 6R15C/NE15B

    So, how can you tell a recent 6R15C is the improved NE15B? Will the dial say, "24 Jewels"? Any indication looking through a clear case back on the watch?

    How long have these been in production?

  4. #4
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    Re: Recently upgraded 6R15C/NE15B

    I said SII 6R15C=TMI NE15B. SII/TMI are already selling 6R15C/NE15B.

    Quote Originally Posted by ChaseT View Post
    So, how can you tell a recent 6R15C is the improved NE15B? Will the dial say, "24 Jewels"? Any indication looking through a clear case back on the watch?

    How long have these been in production?

  5. #5
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    Re: Recently upgraded 6R15C/NE15B

    Interesting, there´s 6r15c with 23j. I´m confused...

    link


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    Re: Recently upgraded 6R15C/NE15B

    Khadgar - my 6R15C says 23 Jewels, as well.

    Do all 6R15C movements have these improvements? Do they also have 24 jewels, even though they're marked 23 jewels or is it a running production change in the 6R15C?

    What is TMI and SII?
    Last edited by ChaseT; March 20th, 2012 at 19:08.

  7. #7
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    Re: Recently upgraded 6R15C/NE15B

    According to Jake, early production of 6R15C has 23J, late production of 6R15C and TMI NE15B has 24J.

    You can download service manual from here:
    http://www.timemodule.com/sii/pdf/ne15_TG.pdf

    and assembly manual:
    http://www.timemodule.com/sii/pdf/ne15b_SS.pdf

    SII=Seiko Instrument Inc
    TMI=Time Module Inc

    TMI is a Seiko's sales company, selling SII movement under different brand name (So basically you cannot obtain Seiko movements).


    Quote Originally Posted by ChaseT View Post
    Khadgar - my 6R15C says 23 Jewels, as well.

    Do all 6R15C movements have these improvements? Do they also have 24 jewels, even though they're marked 23 jewels or is it a running production change in the 6R15C?

    What is TMI and SII?
    Last edited by dkbs; March 20th, 2012 at 19:33.

  8. #8
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    Re: Recently upgraded 6R15C/NE15B

    Thanks.

  9. #9
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    Re: Recently upgraded 6R15C/NE15B

    could it be a move to make it part compatible with the 4R3X series unifying most of the production ?

  10. #10
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    Re: Recently upgraded 6R15C/NE15B

    One goal of this upgrading (from 6R15B to 6R15C) is to unify parts production so that all low beat movements share some common parts. For example: Upgrading from 6R15A to 6R15B, Seiko applied some 6R20A parts (bridges) to 6R15B. Upgrading from 6R15B to 6R15C, Seiko applied some 4R3X parts to 6R15C, fro example, rachet sliding spring on 6R15C is from 4R3X/NH3X.

    In fact, 7S and 6R15 share the most common parts except some bridges. If you want day on your 6R15, just install 7S26 day wheel/jumper on 6R15 to make it day-date. Among those SII brothers and sisters, 6R20 is a very unique one, almost zero parts are similar to 6R15. For example, balance cocks, they look similar but they have 1 degree difference.



    Quote Originally Posted by Alpinist View Post
    could it be a move to make it part compatible with the 4R3X series unifying most of the production ?
    FOOGauzie likes this.

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