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Stan
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Posted on Wednesday, November 08, 2006 - 05:35 pm:   

Is there any way to check on the date (or aprox. date) of manufacture of a LeCoultry & Cie Atmos clock? The serial no. is 77936. I was thinking it may be pre 1937, which is when Jaeger-LeCoultre was formed. But is has VXN after the word "Jewels" and someone thought that indicated it was from the 50's. Thanks.
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Zaf
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Posted on Wednesday, November 08, 2006 - 06:16 pm:   

They have their own serial number scheme. Sounds like it is from the 1950s.
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Stan
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Posted on Wednesday, November 08, 2006 - 08:10 pm:   

It could be the 50s, even if it says LeCoultre & Cie rather than Jaeger LeCoultre? Was LeCoultre & Cie still around then?
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Zaf
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Posted on Wednesday, November 08, 2006 - 08:29 pm:   

Yes.I have a 156,000 "LeCoultre" Atmos that dates to 1962. I'd guestimate yours is about 10 years earlier.
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Gregb
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Posted on Thursday, November 09, 2006 - 04:02 pm:   

Your Atmos was produced in late 1955. The movement is a caliber 426.

Greg
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Gatorcpa
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Posted on Thursday, November 09, 2006 - 04:06 pm:   

I read a formula on an Atmos website that went something like this:

Divide the serial number by 20,000. Take the quotient and add it to 1954. Convert the remainder into months. This will get you close, but not exact.

For example, take 78,000 / 20,000 = 3.9
3.9 + 1954 = 1957.9, or about November 1957.

Also, my understanding is that all Atmos sold through US authorized JLC dealers were inscribed LeCoultre & Cie. Some were made by JLC for others under contract such as Gruen and Cartier.

Sometime in the 1970's, the LeCoultre name was dropped in the USA and all clocks were given the JLC name.

I have one of the later versions from 1969-70, which had a LeCoultre name, but a JLC logo tag.

Hope this helps,
gatorcpa
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Zaf
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Posted on Thursday, November 09, 2006 - 04:50 pm:   

Totally undervalued clock by the way. I'm loading up on these. I have 3 on mantles already!
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Gregb
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Posted on Thursday, November 09, 2006 - 07:26 pm:   

Mike Murray, who has one of the largest Atmos repair shops in the country, has been compiling a huge list of Atmos production dates for years using the bellows date. His list shows the production date for an Atmos with a 77936 serial number as late August 1955.

Greg
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Gatorcpa
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Posted on Thursday, November 09, 2006 - 10:57 pm:   

Gregb -

Your response is interesting, as I got the information in my post from Mike's website:

http://www.atmos-man.com/atmosdat.html

I just simplified the math a bit. If you paid the $10 for the detailed list, then your information is better than mine.

It's close enough for me.

gatorcpa
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Gregb
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Posted on Friday, November 10, 2006 - 02:51 am:   

Yep, I purchased the list a long time ago. I think he developed the formula to approximate the empirical data he collected from the clocks, but the actual production dates vary +/- by a couple years from the actual production dates collected.

Greg