MO accuracy - what it is capable of

Thread: MO accuracy - what it is capable of

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  1. #1

    Join Date
    Sep 2006

    MO accuracy - what it is capable of

    I have one of the very early MO in its production run. When the watch was new, it was gaining almost 20 sec/day - not exactly impressive at all. After a few rounds of rotation (got worn about a week every 3 months), it has settled down to about +15/day.

    Perhaps I was bored, but I opened it one day to see what the movement is capable of. I had hoped to calibrate it to within the COSC spec.

    After about 10 calibrations in 7 days, I arrived at the current calibration. Result - it is pretty much dead on every day (consistently from day to day), over a period of six days, it lost a total of .5 seconds.

    Well, I have to say it has to be the most accurate watch in my collection right now. It is not only accurate, but the rate consistence from day to day is absolutely outstanding!

    The finer point, turning the screw clockwise slows down the watch, counterclockwise speeds it up. It is very sensitive, it will gain 2-5 seconds for every quarter turn of the screw, so you have to be patient. And accuracy in a stationary position is also a little different from when the watch is being worn. I use a Witschi Expert II for baseline static timing, and then close it up and wear it for 12-24 hours for on the wrist timing.

    And of course, do it in a dust free environment to keep the inside dust free.

    I don't expect Stowa to be able to spend this much time (plus the new watches aren't run in yet) on the calibration. But if you have the right tool and the patience, you can get one heck of an accurate watch out of the MO. Just thought I would share it with you tinkerers out there.

  2. #2
    Member scm64's Avatar
    Join Date
    May 2007
    N27° 56.79', W082° 27.55'

    Re: MO accuracy - what it is capable of

    Good to know! I am not a tinkerer though and the thought of opening up one of my watches is scary (for me at least). Since I only wear it on occasion and not as part of regular rotation, as long as it is not way out of whack, I am fine with it. But I think last time I checked it was around 6 seconds fast per day.

    But since it is mainly an event watch (dinner, wedding, meeting), it gets a day of wear at most then goes back into waiting. I do wind it at least every other week though, just to give it some love. Love the watch, Stowas are great!

    Thanks for sharing.
    Florida, USA

    Sinn 103 St Sa LE
    Sinn 757 UTC
    Sinn U1
    Sinn 6100 Regulatuer
    IWC Aquatimer
    NOMOS Tangomat Datum
    Stowa Marine Original, 80th anniversary LE
    Stowa Seatime
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    Zinex Trimix GMT PVD LE Black Pirate
    Ocean 7 LM-2 GMT SE PVD
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    Seiko Kinetic Sportura SNL029P1 PVD
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    Citizens Eco-Drive Calibre 8700 BL8000-03A
    Citizens Eco-Drive Largo Perpetual Calendar
    TX 730 w/ FlyBack Chrono
    Poljot Sturmanske Chrono
    Aristo Apucto HP6
    Casio ToughSolar ProTrek Titanium
    Various G's

  3. #3
    Join Date
    Dec 2007

    Re: MO accuracy - what it is capable of

    When we talk about accuracy in a watch we usually are concerned with consistency, correct? If a watch is always within a second of being 20 seconds fast per day, then all that needs to be done is adjust it to 20 minutes slower. Is that about right or is that oversimplified?


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  5. #4

    Join Date
    Sep 2006

    Re: MO accuracy - what it is capable of

    You are right. The challenge is the accuracy often varies with watch position, movement of the wrist, temperature, main spring tension, etc... So when you adjust it to be exact with the face down at room temperature on a timer, it does not mean the accuracy would be the same when the watch is being worn (position always changing, temperature at a little below skin temperature, plus impact from wrist movements, etc...) That is why I always take multiple tries, the timer result is just a baseline to start with.

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