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 Post subject: Checking accuracy.
PostPosted: Thu Nov 28, 2019 3:36 pm 
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When checking your watch for accuracy against the atomic clock, is it normal for the accuracy to fluctuate? One days it's running -2secs and the other +1.

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 Post subject: Re: Checking accuracy.
PostPosted: Thu Nov 28, 2019 10:43 pm 
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1st timer wrote:
When checking your watch for accuracy against the atomic clock, is it normal for the accuracy to fluctuate? One days it's running -2secs and the other +1.
Without knowing the model of the watch you are talking about I would say that it is 99.9% expected behaviour. For a COSH certified automatic the spec is -4 +6 seconds per day and it can go either way on a daily basis as that timing depends on a number of variables like temp, orientation wind level etc.

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 Post subject: Re: Checking accuracy.
PostPosted: Fri Nov 29, 2019 2:43 am 
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Sorry about that. The model I'm referring to is the hercules which is cosc.

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 Post subject: Re: Checking accuracy.
PostPosted: Fri Nov 29, 2019 3:14 am 
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no matter what the model is, these fluctuations are typical for mechanical watches as @Arcam explained; -2 to +1 is exceptionally accurate, even for a Chronometer ;)


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 Post subject: Re: Checking accuracy.
PostPosted: Fri Nov 29, 2019 4:48 am 
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I'd say you're doing rather well for a watch as old as the Herc and only a -2/+1 variation. :thumbsup:

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 Post subject: Re: Checking accuracy.
PostPosted: Fri Nov 29, 2019 5:21 am 
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Good to know. The watch was serviced about a year ago.
Has been serviced every 2 years by previous owner.

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Oris Artelier Worldtimer Centennial
Vintage 1920 Oris
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