Mechanical Movement Break in?
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  1. #1
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    Mechanical Movement Break in?

    I searched but didn't find this topic.

    On a high quality watch (in this case a Tudor Black Flag, COSC) do the movements run better after having days/weeks/months of wear on them?

    If so, at about what point should one expect them to run as well as they're going to?

  2. #2
    Member yankeexpress's Avatar
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    Re: Mechanical Movement Break in?

    Tudor and Rolex run them in pretty well at the factory, so WUSIWUG most likely.

  3. #3
    Member lmarino1's Avatar
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    Re: Mechanical Movement Break in?

    A COSC spec watch will be tuned out of the box

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  5. #4
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    Re: Mechanical Movement Break in?

    High end watches, especially COSC certified, will Run spot on from day one. The tolerances re such that no real break in is required.

  6. #5
    Member timefleas's Avatar
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    Re: Mechanical Movement Break in?

    If you want an answer based on actual data, rather than conjecture, then, for most new automatics, there is typically a 2 week to 2 month break in period, during which time, the day to day rhythms differ slightly, and there is sometimes significant fluctuations in gain/loss per day. Several threads have shown this, but the best is by user "Balldy", who did a daily six plus months graph on a brand new ETA-powered watch, which clearly showed the break-in period before stabilization. Others have demonstrated this even for COSC movements--all of this clearly shown on existing threads here on WUS--search out Balldy's for a start.

    Of course there are exceptions to every rule, but most watches do require a bit of time before they stabilize, COSC naturally less so, since their specs are tighter--but even COSC is a combined stat, based on monitoring several different positions, recorded over a very short period of time--your own mileage may, and often does, vary.
    Last edited by timefleas; February 5th, 2018 at 04:37.
    Gary123 likes this.

  7. #6
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    This is a fascinating question, thank you for asking it; I would not have thought of it myself.

  8. #7
    Member pithy's Avatar
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    Re: Mechanical Movement Break in?

    A new quality movement that is freshly serviced will run at a settled rate as delivered.

    It's not a car.
    Courtesy of ULF.

  9. #8
    Member adimaano56sl's Avatar
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    Re: Mechanical Movement Break in?

    Every NEW ETA 2824-2 watch I've owned exhibited a slowing down of the movement within the first few months of use. Usually started around +6-10 seconds a day and settled to around +2.
    My Timfactors speedbird with a top grade 2824 has settled to+.3 seconds a day - pretty awesome.

  10. #9
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    Re: Mechanical Movement Break in?

    I have seen too many threads where people post their experiences to say it doesn’t happen. I think it depends how long it has been from test to delivery and how it has been stored. I think it’s mostly down to oils.

    From my 3 examples of buying new watches and tracking this, they have all exhibited it to some extent. A COSC eta had a wild first couple of days and then settled to something on the outer reaches of respectability, a Seiko 6R didn’t take much setting in time but also never really became very accurate and regular, and my Grand Seiko has a couple of days at about +6 or 7 before setting to a very steady +0.5 spd.


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  11. #10
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    Re: Mechanical Movement Break in?

    don’t think there is a break in period actually.. timing it on the first day over 24 hours would be pretty accurate i shall say

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