Types of 2824-2 mechanism in airman

Thread: Types of 2824-2 mechanism in airman

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  1. #1
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    Types of 2824-2 mechanism in airman

    I was reading in another watch forum that there are multiple types of 2824-2 mechanism- Standard, Elabore, Top, and Chronometre.

    Standard/Elabore has straighter balance wheel spoke (not as flared near the rim), and the balance wheel mount does not have an incabloc shock mount like the Top/Chronometre version (incabloc seems to have a "screw head" at the centre of the balance wheel with the incabloc spring, the etachoc in the cheaper one just has something that looks like a circlip).

    My question is- are the automatic Flieger movements different between non-COSC and COSC versions?

  2. #2
    stuffler,mike
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    Re: Types of 2824-2 mechanism in airman

    Quote Originally Posted by indulis View Post
    ...
    My question is- are the automatic Flieger movements different between non-COSC and COSC versions?...
    Yes they are different, the COSC movement is availbale for additional money only which already suggests that there is a difference.

  3. #3
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    Re: Types of 2824-2 mechanism in airman

    Quote Originally Posted by stuffler,mike View Post
    Yes they are different, the COSC movement is availbale for additional money only which already suggests that there is a difference.
    Not too sure about that Mike..
    The COSC refers to a certificate that has been obtained from an organisation confirming the accuracy of the movement.
    There is a cost attached to this - which would have to be passed on by Stowa.
    All I am saying is that there is not necessarily any big difference in terms of the movement, just because one has been put through COSC approval and the other has not.
    Probably you will find that they are both the same grade of 2824.
    Happy to be proved wrong - just wanted to help de-mystify a little.

    Regards

    Mark

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  5. #4
    stuffler,mike
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    Re: Types of 2824-2 mechanism in airman

    Here is my standard reply

    ETA grades 2824-2 related

    Standard and Elaboré:
    Mainspring - Nivaflex NO
    Shock protection - Etachocs
    Pallet stones - Polyrubies, Epilame-coated
    Balance - Nickel gilt
    Balance staff - Epilame coated
    Collet - Nivatronic
    Hairspring - Nivarox 2
    Hairspring heat treatment - Etastable

    Top and Chronometre:
    Mainspring - NivaflexNM
    Shock protection - Incabloc
    Pallet stones - Red rubies, Epilame-coated
    Balance - Glucydur gilt
    Balance staff - Epilame coated
    Collet - Nivatronic
    Hairspring - Anachron
    Hairspring heat treatment - Etastable

    The performance differences are the big differences between the various grades: ("The limit values are subject to interpretation: 95% of the pieces delivered in a lot must be within the specified limits.")

    Standard:
    2 positions (CH, 6H)
    daily rate: +/-12 sec/day
    Maximum positional variation: 30 sec
    Isochronism (between 0 and 24 hours): +/- 20 sec

    Elaboré:
    3 positions (CH, 6H, 9H)
    daily rate: +/-7 sec/day
    Maximum positional variation: 20 sec
    Isochronism (between 0 and 24 hours): +/- 15 sec

    Top:
    5 positions (CH, FH, 6H, 9H, 3H)
    daily rate: +/-4 sec/day
    Maximum positional variation: 15 sec
    Isochronism (between 0 and 24 hours): +/- 10 sec

    Chronometre:
    As per COSC specifications, which as far as most owners will notice, isn't much different from Top grade.
    For COSC see: www.cosc.ch

  6. #5
    Member Dr. Robert's Avatar
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    Re: Types of 2824-2 mechanism in airman

    Very informative, Mike...thanks!

  7. #6
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    Re: Types of 2824-2 mechanism in airman

    Am considering an Airman without logo.

    Question about the movement options.

    Is the non COSC the same exact movement as the COSC version? Or does the COSC version have upgraded parts?

    In other words, is the COSC version just a certified version of the exact same movement?

  8. #7
    stuffler,mike
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    Re: Types of 2824-2 mechanism in airman

    Quote Originally Posted by es335 View Post
    Am considering an Airman without logo.

    Question about the movement options.

    Is the non COSC the same exact movement as the COSC version? Or does the COSC version have upgraded parts?

    In other words, is the COSC version just a certified version of the exact same movement?

    Go to ETA SA Customer Service here https://secure.eta.ch/CSP/DesktopDef...ndex=0&tabid=1, click on "Technical Ducuments", type 2824-4 et voilá....
    Last edited by stuffler,mike; April 25th, 2009 at 10:39.

  9. #8
    Member Lencoth's Avatar
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    Re: Types of 2824-2 mechanism in airman

    Quote Originally Posted by stuffler,mike View Post
    Go to ETA SA Customer Service here https://secure.eta.ch/CSP/DesktopDef...ndex=0&tabid=1, click on "Technical Ducuments", type 2824-4 et voilá....
    As you said Top and COSC are basically the same (except for the certification). Question unanswered is what Stowa uses in their non-COSC watches, I assume it will be elaboré.

  10. #9
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    Re: Types of 2824-2 mechanism in airman

    Quote Originally Posted by Lencoth View Post
    As you said Top and COSC are basically the same (except for the certification). Question unanswered is what Stowa uses in their non-COSC watches, I assume it will be elaboré.
    +1. This is an unanswered question. Anyone know for sure what grade is in the non COSC auto Airmans?

  11. #10
    Member rfjacques's Avatar
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    Re: Types of 2824-2 mechanism in airman

    I believe Jorg uses the top grade 2824-2 in the Airman. I say believe because my Airman has what looks to be the characteristic hourglass shaped incabloc shock protection, which is only available on top and chronometre grades 2824's. I have not been able to locate a photo of the etachoc shock protection used in the standard and elaboree grades for comparison. So take that FWIW.
    // Rob




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