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Thread: Accuracy of an 8 day movement?

  1. #1
    Master
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    Accuracy of an 8 day movement?

    I know good time keeping is an issue with watches with long power reserve. I have never had joy with my IWC or Panerai. I just wonder what is acceptable over a 7 day period in terms of time gain / loss?

  2. #2
    Master daveyw's Avatar
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    I’ve had no problem with my Radiomir 268. You have a reserve indicator, just see how it goes on the last day and if you have any variances then. I always rewound mine before it ran out and it was fine

  3. #3
    Master MartynJC (UK)'s Avatar
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    I'm going to have a stab - For me 30sec gain/loss over 7 days would be acceptable to me (for a non-COSC watch).

    It's bit like a piece of string though. Others may expect tighter accuracy.

  4. #4
    Master ryanb741's Avatar
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    I had a Panerai with an 8 day movement and it deviated an average of 4 secs a day but actually would gain a minute and a half by day 3 and then slow down to be around 30 secs fast after 8 days. That was acceptable to me and within spec

  5. #5
    Master
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    I had a PAM with an 8 day movement, 346, and it was super accurate, well within cosc over an 8 day wind.

    Sent from my SM-G920F using Tapatalk

  6. #6
    Master Papa Hotel's Avatar
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    Mine maintains a consistent small gain for the first 6/7 days but it really takes off as it's getting towards the end. Not a massive issue as I switch out all the time but if wearing for more than a week at a time it's no great hardship to wind it up once a week to maintain the rate.

  7. #7
    Master Papa Hotel's Avatar
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    Quote Originally Posted by Robsmck View Post
    I had a PAM with an 8 day movement, 346, and it was super accurate, well within cosc over an 8 day wind.

    Sent from my SM-G920F using Tapatalk
    That'll be the one! I'm finding it gaining around 5-7 seconds on day 8 but before that it's around a second.

  8. #8
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    I have had 3 Pam's with an 8 day movement, the 233 with the in house P.2002/1 and a 590 with the in house P.5000 and both have been accurate over the 8 day period, I personally am happy with +/- 6sec per day and IIRC these were pretty damn close to that. Also have the 190 with the JLC 8 day and I tested it with/against the 233 and there was no noticeable difference, albeit the JLC winds like butter and is much nicer to look at.

    I love 8 day manual movements! Best of all worlds.

  9. #9
    Master MartynJC (UK)'s Avatar
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    Can anyone comment on any 8 day IWC experiences?

  10. #10
    Grand Master andrewcregan's Avatar
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    Quote Originally Posted by MartynJC (UK) View Post
    Can anyone comment on any 8 day IWC experiences?
    Timed my BP over 23 days, and it gained an average of 6.7 sec/day. It was well wound for the majority of the time.

  11. #11
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    Quote Originally Posted by Papa Hotel View Post
    That'll be the one! I'm finding it gaining around 5-7 seconds on day 8 but before that it's around a second.
    Hope you are still enjoying it mate. The best everyday wearing radiomir by far IMHO. Miss it

    Sent from my SM-G920F using Tapatalk

  12. #12
    Master Papa Hotel's Avatar
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    Quote Originally Posted by Robsmck View Post
    Hope you are still enjoying it mate. The best everyday wearing radiomir by far IMHO. Miss it

    Sent from my SM-G920F using Tapatalk
    Absolutely love it. Nice and chunky but wears small because of the lugs, light because it's titanium. I wondered if the handwind and date would be an issue for me but with an 8 day movement it's no great hardship and the date function, while not for the purists, is useful. There's nothing for me to dislike about it, a Panerai can be a head AND heart purchase!

  13. #13
    Master
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    Two things to say/share on this.

    I have three 8 day Panerai and did a test on one of them (233) and it ran for 10 1/2 days and was keeping accurate time for 10 days of that time. https://forum.tz-uk.com/showthread.p...8-day-movement

    As for longer term my 670 has lost 20 secs over the last 22 days, and -36 since 15th April. So less than -1 sec a day. It's not been fully wound a lot of the time and has been mostly off the wrist.

    I would say that's pretty impressive.

    Sent from my moto g(7) power using Tapatalk

  14. #14
    Last time I did any measurements on my Portuguese 5001, several years ago, it could run at +4 seconds per day but, from memory, that was very much position dependent.

  15. #15
    Master
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    So I have timed my watch over last 8 days. It is losing about 10 seconds a day and more on the final day, giving a total time loss of 100 seconds over 8 days. The movement is a Panerai 2002. Is this acceptable or should I get Panerai to have a look?

    BTW it is still under warranty

  16. #16
    Master
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    Quote Originally Posted by tim2012 View Post
    So I have timed my watch over last 8 days. It is losing about 10 seconds a day and more on the final day, giving a total time loss of 100 seconds over 8 days. The movement is a Panerai 2002. Is this acceptable or should I get Panerai to have a look?

    BTW it is still under warranty
    Deffo send it back. I sent a 422 back as it was loosing time and it came back all sorted and with a full service done foc, paperwork and book stamped.
    People complain about PAM customer service but my experience has been positive on each occasion I had to use them. Maybe a little slow but that would be my only slight moan.

    Sent from my SM-G920F using Tapatalk

  17. #17
    Master daveyw's Avatar
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    Quote Originally Posted by tim2012 View Post
    So I have timed my watch over last 8 days. It is losing about 10 seconds a day and more on the final day, giving a total time loss of 100 seconds over 8 days. The movement is a Panerai 2002. Is this acceptable or should I get Panerai to have a look?

    BTW it is still under warranty
    If One and a half minutes a week bothers you, then yes, send it back

  18. #18
    Master Papa Hotel's Avatar
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    Quote Originally Posted by Papa Hotel View Post
    Mine maintains a consistent small gain for the first 6/7 days but it really takes off as it's getting towards the end. Not a massive issue as I switch out all the time but if wearing for more than a week at a time it's no great hardship to wind it up once a week to maintain the rate.
    OK, I've had it running since 29th May, that's 13 days now. And in that time... it's bloody bang on. I had set it around 15s behind in anticipation of it gaining a little a day but it's still 15s behind. Ridiculous.

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