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What is the tolerance for time gain/loss per day for a Big Pilot 5009?

  • forum 7 replies
  • last reply by fleekk 21 Oct 2014
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    Mr. Chris Petras
    Apprentice 4 posts
    20 Oct 2014, 10:53 a.m. 20 Oct 2014, 10:53 a.m.
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    I'd be interested in other members experience with their BP's.

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    Tilo
    Master 3246 posts
    20 Oct 2014, 1:12 p.m. 20 Oct 2014, 1:12 p.m.
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    IWC's specs are between +-0 and +7 sec/day. That is a good mark for all IWC watches I think.
    I once had a 5001 Portuguese Automatic with the same movement for several years which was always in this spec around +5.
    Unfortunately not (yet) a BP owner.

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    Mr. Frank Beninato
    Graduate 19 posts
    20 Oct 2014, 1:59 p.m. 20 Oct 2014, 1:59 p.m.
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    I've noticed that my BP 5009 is most accurate when fully wound (around 6-7 days left in "reserve"). That being said, I noticed that it may be ~10 seconds fast after three or four days, but then as time passes, it will come back between the +0-7 seconds.

    I used to be worried about it, but then realized (1) its still a piece of machinery which we should expect some variance, and (2) I have nowhere to be that needs +-0 to +-7 seconds accuracy!

    Enjoy your watch.

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    Michael Friedberg
    Moderator 11468 posts
    20 Oct 2014, 2:21 p.m. 20 Oct 2014, 2:21 p.m.
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    Hi FrankBen,

    Most watches should be most accurate when fully wound; in theory they are regulated and adjusted at that state. As a watch with a long mainspring unwinds that accuracy should change slightly due to natural isochronism error.

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    Mr. Chris Petras
    Apprentice 4 posts
    21 Oct 2014, 10:02 a.m. 21 Oct 2014, 10:02 a.m.
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    Thank you all for your comments. This is my first IWC, and have been a big fan of the BP since they were released. I've only had this piece for a couple of weeks and finding that it is gaining circa 7-10 seconds per day, not a big deal but as I have been wearing Rolex and Zenith for the last 10+ years have not been use to such variance. In any case I am giving this piece all my wrist time and absolutely love it.
    I'm also impressed with the input from devoted IWC collectors on this forum to all topics.
    Looking forward to exchanging more experiences with you all.
    Thanks Chris

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    Tango Victor
    Master 1942 posts
    21 Oct 2014, 11:01 a.m. 21 Oct 2014, 11:01 a.m.
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    Chris...

    You must share a photo of your 5009! Congratulations.

    Regards,
    Thang

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    Mr. Chris Petras
    Apprentice 4 posts
    21 Oct 2014, 11:35 a.m. 21 Oct 2014, 11:35 a.m.
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    Thang,
    Happy to provide some pics, but how do I add them to the post?

    Cheers
    Chris

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    Mr. Francis Lee
    Master 552 posts
    21 Oct 2014, 11:46 a.m. 21 Oct 2014, 11:46 a.m.
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    BP5009 has written:

    Thang,
    Happy to provide some pics, but how do I add them to the post?

    Cheers
    Chris

    Congrats to your 5009.

    I host the picture in photo bucket, paste the image link here in your posting and it's done.

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