COSC Certification

Thread: COSC Certification

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  1. #1

    Join Date
    Feb 2009
    Posts
    14

    COSC Certification

    http://stowa.de/shop/cgi-bin/lshop.c...flieger--f40lb

    I wonder if it's worth the money 210 euro the COSC certification

    which is the difference between this and the basic one?

  2. #2
    stuffler,mike
    Guest

    Re: COSC Certification

    This is one of your first posts here and you may not know that we offer a cross-forum-search-function. Typing ETA 2824 or COSC will lead you to a bunch of threads/posts not to say tons.

    https://forums.watchuseek.com/showthread.php?t=228380

    https://forums.watchuseek.com/showthread.php?t=174408

    https://forums.watchuseek.com/showthread.php?t=148016

    https://forums.watchuseek.com/showthread.php?t=150927

    https://forums.watchuseek.com/showthr...2325&highlight


    Sources you may look at to find out more: wikipedia, www.eta.ch, www.cosc.ch.

    Shortly and my standard answer:

    There are 4 grades of ETA 2824-2 movements offered by ETA:

    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.

  3. #3

    Join Date
    Feb 2009
    Posts
    14

    Re: COSC Certification

    ok sorry for the new post next time I will search

    excuse me but I'm really ignorant with watches and new in this world

    so COSC certifies the movement and not the watch, is this right?

    if it's true, the cosc movement could be assembled not in the right way and loose the advantage of the certification?

    do you think that 210 euro is a reasonable cost for what you get?

    I don't know if choosing the cosc or not

    thank you

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  5. #4
    stuffler,mike
    Guest

    Re: COSC Certification

    Quote Originally Posted by yatahaze View Post
    so COSC certifies the movement and not the watch, is this right?
    Yes.

    if it's true, the cosc movement could be assembled not in the right way and loose the advantage of the certification?
    Well, if a watchmaker screws up the movement when mounting it into a case he's not a good watchmaker. I wouldn't care about that that much.

    From COSC:

    Quote:
    How long is a chronometer title valid ?
    The title of chronometer can be compared to a diploma from a specialized school. At a given time of his life, a candidate has proven, thanks to an exam, that he had met with the performances criteria providing him with that title.
    In the same way as for a graduate, this title has been granted to him for his entire life, although his performances may slightly get altered within the years.
    End quote.

    do you think that 210 euro is a reasonable cost for what you get?
    It comes down to a very personal decision. I don't need the COSC certification. Most of the Stowa watches perform very well, even if not certified by COSC.

  6. #5
    Member
    Join Date
    May 2007
    Posts
    363

    Re: COSC Certification

    Mike - perhaps you need to update some of the FAQ's to include some of the Frequently Asked Questions you frequently get asked
    Antea Black (Date - Milanaise Bracelet)
    Antea Creme COSC (No Date - Blued Hands)
    Antea KS
    Black Forest Flieger LE
    Flieger B-Uhr
    Flieger 2801 LE

    Marine 2801 HW
    Marine Original
    Chrono 1938 Black
    Seatime Blue (ProDiver Bezel)
    Seatime WUS LE
    70's Quartz,
    Vintage PUW


  7. #6

    Join Date
    Feb 2009
    Posts
    14

    Re: COSC Certification

    could you please post 2 photos of the bottom of the flieger with COSC certification and without?
    are there any differences in the material used?

    thank you

  8. #7
    stuffler,mike
    Guest

    Re: COSC Certification

    Quote Originally Posted by yatahaze View Post
    could you please post 2 photos of the bottom of the flieger with COSC certification and without?
    are there any differences in the material used?

    thank you
    What doe you mean by "differences in material used" ? There's no difference in case material which is ss 316L. Regarding different materials of the movements please re-read my post above. A COSC ETA 2824-2 does differ from a standard ETA 2824-2 as already mentioned.

    Flieger Auto without logo:





    Stowa ETA 2824-2 COSC movement



    More on www.stowa.de or www.stowa.com

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