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Old 3 July 2010, 01:17 AM   #1
jldc
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Regulating watch accuracy

My wife's datejust gains 4-5 sec a day. I know that you can adjust or compensate for this by laying the watch in different positions at night. Do you have to try each position (crown down, face down, etc) and see if it helps or hurts, or do certain positions generally make the watch gain/loose time? It seems like I've read that somewhere, but I can't find it.
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Old 3 July 2010, 01:23 AM   #2
nowzen
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I read it somewhere too, can't remember.

I think it was watch on back = gains
watch on side, crown down = to lose
watch on side, crown up = to lose more.

experts correct me if I'm wrong.
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Old 3 July 2010, 01:40 AM   #3
tomchicago
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crown down i heard loses more. crown up loses, but less. back gains.

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I read it somewhere too, can't remember.

I think it was watch on back = gains
watch on side, crown down = looses
watch on side, crown up = looses more.

experts correct me if I'm wrong.
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Old 3 July 2010, 02:42 AM   #4
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Quote:
Originally Posted by nowzen View Post
I read it somewhere too, can't remember.

I think it was watch on back = gains
watch on side, crown down = to lose
watch on side, crown up = to lose more.

experts correct me if I'm wrong.
This is correct
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Old 3 July 2010, 01:42 AM   #5
jldc
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"on it's back" = crystal up?
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Old 3 July 2010, 01:43 AM   #6
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Please don't get to annal about timekeeping COSC spec is a AVERAGE -4 to + 6 seconds over any 24 hour period.Below tend to work better on the older type calibres like the 15 series but its the same for 31 and 30 series.

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Old 3 July 2010, 02:14 AM   #7
chris russell
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not sure how much position affects womens' watches, since they have flat...

hairsprings, but I do know that the 3130-series and 4130 movements, (with overcoil hairsprings), show negligible variation with position. I would expect your wife's watch to show very little as well. If the 4-5 sec/day gain bothers her, RSC will regulate it at N/C to within a second or two.
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Old 3 July 2010, 02:50 AM   #8
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not sure how much position affects womens' watches, since they have flat... hairsprings, but I do know that the 3130-series and 4130 movements, (with overcoil hairsprings), show negligible variation with position. I would expect your wife's watch to show very little as well. If the 4-5 sec/day gain bothers her, RSC will regulate it at N/C to within a second or two.
The ladies cal 2235 has a Breguet type hairspring.




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Old 3 July 2010, 02:29 PM   #9
jldc
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Thanks for the help. It really doesn't bother her much at all, but she has to set it down in some position when she takes it off at night, so she might as well choose a position that helps regulate it, right?

L
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Old 3 July 2010, 02:48 PM   #10
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Quote:
Originally Posted by jldc View Post
Thanks for the help. It really doesn't bother her much at all, but she has to set it down in some position when she takes it off at night, so she might as well choose a position that helps regulate it, right?

L
Makes sense to me, saves adjusting the watch more often.
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Old 3 July 2010, 05:05 PM   #11
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Doesn't do any harm to try but I've not noticed any difference with a 14060M.
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