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Best way to store overnight in terms of accuracy?
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Author:  coltstrong [ Sat Jan 12, 2013 3:18 pm ]
Post subject:  Best way to store overnight in terms of accuracy?
I searched for but couldn't find this subject.

In terms of a breitling 13 calibre whats the best way to store over night or over 24 hours. I've noticed my watch seems to gain more time overnight (+.5 seconds per hour) versus when I'm awake (+.3-.4/s hour) the longer I leave the watch the more time it gains. Would a winder or a particular position slow it down a bit?

This is in a b13048 example. Thanks
Author:  Roffensian [ Sat Jan 12, 2013 3:28 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
Accuracy is affected by a lot of different factors. With a watch that old the immediate suggestion is that it may need a service if it hasn't had one recently as that will be the single biggest impact on accuracy.

As a general rule a watch will run faster laid flat on its back than laid on its side crown up (the two common positions), so to slow it down try crown up if it is currently laid flat. A watch winder may impact accuracy, but impossible to say whether for better or worse. With a winder the watch will be in a vertical position and at rest (assuming that it is not a constant rotation winder) the watch might be crown up, down, left or right, all of which will cause the watch to run at a different rate. Additionally the average power reserve in the mainspring will be higher, which will again cause the watch to run at a different rate - impossible to say faster or slower and by how much because there are so many variables at play.

Of course changing the thermostat on your heating / air conditioning can also affect accuracy, so can the amount of humidity, the degree of activity that you have subjected the watch to the day before, etc, etc, etc.
Author:  Racerdj [ Sat Jan 12, 2013 3:38 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
Face up at night was +1 second/day Then I read on this forum to try it's side at night and it is 0.7 seconds/day according to Verizon Wireless minute change on my cell phone.
Author:  coltstrong [ Sat Jan 12, 2013 3:46 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
What kind of accuracy can I expect after a recently serviced B13048? +1s sounds perfect.
Author:  Leonidas [ Sat Jan 12, 2013 3:49 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
I think Roff said it all. Ill chime in as my Super Avenger (B13) runs fast on the wrist. When I rest it crown-pusher end up at night, it slows down quite a bit. I've noticed this behavior in almost every eta based watch I've owned regardless of brand. Of course environmental factors vary. Give it a try.
Author:  P51 [ Sat Jan 12, 2013 5:01 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
Location is one of the biggest test areas for watchmakers when calibrating or re-timing a watch. It takes what seems to be an iternity to test and get right. Moving location and orientation and retesting each time. Then, once the watch is back on the wrist of the owner and subjected to all sorts of environmental conditions that can't be tested for, its surprising how this will affect accuracy.

Leonadis has the right idea in my opinon as this position at rest tends to slow many of my timers as well. Also, place and in a room that replicates normal comfort conditions. Normal rom temperature is a good start. Try to avoid extremes.

Jim
Author:  Roffensian [ Sat Jan 12, 2013 5:24 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
coltstrong wrote:
What kind of accuracy can I expect after a recently serviced B13048? +1s sounds perfect.



It's not COSC certified, but after service COSC standards or close should be readily achievable - -4 / +6 seconds per day.
Author:  thunderbirds [ Mon Jan 14, 2013 8:29 am ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
is that mean COSC standard the watch will increase +6 seconds per day ?
Author:  Roffensian [ Mon Jan 14, 2013 8:40 am ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
thunderbirds wrote:
is that mean COSC standard the watch will increase +6 seconds per day ?



COSC standard for mechanical movements is between -4 to +6 seconds per day.
Author:  Driver8 [ Mon Jan 14, 2013 8:50 am ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
thunderbirds wrote:
is that mean COSC standard the watch will increase +6 seconds per day ?

Not necessarily. A COSC rating means that the movement, when regulated correctly, will keep to within -4 and +6 seconds a day. So, while being highly unlikely, a watch could lose 4 seconds one day and then gain 6 seconds the next, and it will still be COSC compliant. If a watch was to increase by a constant +6 seconds a day, then again it is still within COSC specs. However in practice, most automatic watches don't gain (or lose) exactly the same amount each day. A swing from -4 to +6 would be highly unlikely, but you might see a gain of, say, 2 seconds one day and 1 second the next : these slight deviations are generally due to a number of factors - wearing patterns, temperature, etc, etc - all of which can affect a movements timekeeping fractionally.
Author:  thunderbirds [ Mon Jan 14, 2013 8:53 am ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
thanks for the explanation
Author:  Roffensian [ Mon Jan 14, 2013 8:56 am ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
thunderbirds wrote:
thanks for the explanation


And none of that applies to your watch because it's not mechanical :lol:
Author:  coltstrong [ Sat Jan 19, 2013 4:24 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
Update, after timing for a while I see that it is always a bit fast which is fine but it runs faster the longer its gone since winding. It runs pretty consistant with variations of 8.5 seconds fast after being wound to 15s fast when its not been wound in a while which works out to a .352 to .65/h difference.

The guy I bought the watch from said it was served 18 months ago -- I tend to believe him and was going to service it in about 3 years. Would it make sense to go to an AD and get it regulated before the service schedule?

Since I'm a regulation virgin what should I expect in terms of price and turn around time.
Author:  Roffensian [ Sat Jan 19, 2013 4:59 pm ]
Post subject:  Re: Best way to store overnight in terms of accuracy?
Watches will generally run faster with a low power reserve so that's no surprise. If the rate is consistent (other factors being equal) then a regulation is all that is needed - $20 or so and 10 minutes at most ADs, although a thorough regulation would take a day or so for monitoring in different positions along with an offer to adjust again after a week if real world accuracy differs from timing machine accuracy.
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