Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day
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Thread: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

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  1. #1
    Member FBPB's Avatar
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    Confused Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Ok, I'm regretfully posting this.

    Back in August, I sent by Lunova Tag/Datum to be serviced under guarantee by Mühle due to it not keeping the power reserve. I personally picked it up in Glashütte back in August, when I asked why it was not keeping time, they told me that it must have received a shock (had been dropped) at some point. Personally, I have never, ever dropped, hit or banged the watch (I love it, so I baby it), so I can only imagine it had previously happened at the AD or in transit to the AD.

    It was running perfectly since then. I do not wear it every day, only on special occasions, or when I feel like it. Meaning it can be for days at a time either on my wrist, or in storage.

    Yesterday afternoon I synced it to www.time.is (it was 1/2 a second behind when I synced it), and wore it for a few hours, but took it off in the evening.

    It was still running at 17:00 today, so I put it on. When I checked the time at 21:38 compared to time.is, it was more than 30 seconds slow. It had been laying flat on a desk overnight / during the day today.

    Before I ask Mühle to take another look at it, I wanted to ask you guys if this could be from a lack of power reserve on the main spring (ie: it was not fully wound)?

    Has anyone noticed that a Sellita SW 220-1 runs slow when not kept fully wound?

    Or might it be that this movement needs an adjustment again after only 6 months? I can't believe that it would, unless there is something wrong with the movement itself. I am loath to send it to Mühle again as it is expensive to send.

    Thanks for your input.
    Last edited by FBPB; February 27th, 2020 at 22:08.

  2. #2
    Member FBPB's Avatar
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Side note: have wound it 30 turns by hand and will wear it over night and check again tomorrow AM to see if it keeps time.

    I noticed Mühle gives no specs on accuracy on their site: https://www.muehle-glashuette.de/mue...ersion-muehle/

  3. #3
    Moderator German Watches Forum
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    I think it will be best to wait and see.


    Thanks,
    rationaltime
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  5. #4
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Thanks, that's exactly what I am doing.

  6. #5
    Member Nokie's Avatar
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Possibly got magnetized?

    Good luck.
    "Either he's dead or my watch has stopped"
    Groucho Marx

    "The only reason for time is so that everything does not happen at once..."
    Albert Einstein

  7. #6
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    oh what a bummer. lame that they claimed it was dropped/hit, seems kind of a cop out

  8. #7
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Quote Originally Posted by Nokie View Post
    Possibly got magnetized?

    Good luck.
    Thanks, but never been near one...
    Last edited by FBPB; February 28th, 2020 at 22:26.

  9. #8
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Quote Originally Posted by ocieb View Post
    oh what a bummer. lame that they claimed it was dropped/hit, seems kind of a cop out
    Not really, they said the hairspring had been knocked out of normal place. Since they fixed it, no problems until recently (it's cold now, and I keep the apartment "cold").

    I've worn it all day today, when I compared it at 14:50 today it was 5 seconds fast (!), so I re-synced it at 14:50:15 and laid it flat on my desk at ambient temp (19°C). I will leave over night to see what it gives. The mainspring is very well charged.

  10. #9
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Ok, the problem seems to come down to not being wound enough. Wearing it a few days in a row with the mainspring at full wind and it keeps perfect time.

  11. #10
    Moderator German Watches Forum
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    Re: Lunova Day Date with Sellita SW 220-1 losing 30 seconds per day

    Happy to hear that. I guess you need to wear it every day,
    or at least every other day.


    Thanks,
    rationaltime
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