Forums Latest Auctions Members

accuracy after overhaul

  1. 1st speedy

    1st speedy Aug 2, 2020

    Posts
    172
    Likes
    172
    after getting my watch back from a complete overhaul, i noticed it was within 1 sec for the first few days while on my wrist. after putting it crown down over night,it was at -3 secs and today at -4 secs after leaving it dial up.
    i'm guessing its in the "break in period"? How long after should i check for accuracy?
    Watch is Omega PO 2500C
     
  2. ahsposo

    ahsposo Most fun screen name at ΩF Aug 2, 2020

    Posts
    3,301
    Likes
    16,504
    After 2,208 hours or 3 months, whichever comes first.
     
    Fedev likes this.
  3. Dan S

    Dan S Aug 2, 2020

    Posts
    7,496
    Likes
    17,055
    What is your concern and what are you trying to determine with those observations? Are you trying to determine positional variation or consistency? As you know, watches almost always keep somewhat different time in different positions, so your observations seem in-line with expectations, and a loss of 4s over three days seems excellent to me. Who told you that watches need a break-in period?
     
    1st speedy likes this.
  4. speedytoronto

    speedytoronto Aug 2, 2020

    Posts
    106
    Likes
    127
    Al (Archer watches) has written about this "break in" period before:

    From 2018:
    "I see a lot of people write about this "break in" period on watch forums, but when measured under controlled conditions I've never had a new watch show any significant change in the first few weeks or months. Ask yourself what use chronometer testing would be if the watch was going to drift significantly in the first months of use...this idea makes little sense to me."
     
    italy1861, Dan S and 1st speedy like this.
  5. 1st speedy

    1st speedy Aug 2, 2020

    Posts
    172
    Likes
    172
    I was within 1 sec after 3 days and all of a sudden jumped to 4 secs that's why I ask.
     
  6. 1st speedy

    1st speedy Aug 2, 2020

    Posts
    172
    Likes
    172
    As for "break in period", Archer's post made it clear, thank you.
     
  7. Dan S

    Dan S Aug 2, 2020

    Posts
    7,496
    Likes
    17,055
    So you put the watch into a different position and it ran at a slightly different rate, exactly as expected.
     
    Archer and speedytoronto like this.
  8. 1st speedy

    1st speedy Aug 2, 2020

    Posts
    172
    Likes
    172
    Ok. Thanks
     
  9. EricCsN

    EricCsN Aug 2, 2020

    Posts
    324
    Likes
    1,000
    I get quite a range of variation with watch positioning, try :
    dial out, dial down, crown up, crown down, crown left, crown right.
    perfect normal for a mechanical watch
     
    1st speedy likes this.
  10. s2000_driver

    s2000_driver Aug 3, 2020

    Posts
    61
    Likes
    54
    There will be variation depending on watch position, how much the mainspring is wound etc... I go by performance over a week. Wear it around, live your life and check how it is doing at the end of the week...
     
    1st speedy likes this.
  11. SkunkPrince

    SkunkPrince Aug 3, 2020

    Posts
    745
    Likes
    653
    It doesn’t take much positional change to get a different value for rate. No surface is perfectly flat nor level, so you might not be as consistent as you thought.
     
  12. 1st speedy

    1st speedy Aug 3, 2020

    Posts
    172
    Likes
    172
    I guess I was expecting more accurate deviations coming from a coaxial.
    All good.
     
  13. 1st speedy

    1st speedy Aug 3, 2020

    Posts
    172
    Likes
    172
    These watches are anti magnetic as we all know. The master chronometers are rated to resist up to 15000 Gauss. Is it known as to how much can the non master chronometers can resist?
     
  14. SkunkPrince

    SkunkPrince Aug 3, 2020

    Posts
    745
    Likes
    653
    Probably a tenth of that? I checked the 1120 technical guide, didn't see a spec.

    Note that even a 15000 gauss (1.5T) watch can be magnetized; it's just that it will still run.