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Marv
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Username: Marv

Post Number: 1
Registered: 01-2008

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Posted on Tuesday, January 08, 2008 - 07:57 pm:   

Hi,

I am interested in vintage military chronographs (with a particular focus on french type 20) and I have recently found a chronograph that requires your help.

Front

This chrono has a chromium case and a stainless steel back with fixed lugs.
The back is engraved: "1/5 SEC.T.P" with a broad arrow. Inside, a single number: "5810"

Back1

Back2




The chrono starts with the upper pusher, stops with the lower one, BUT the reset to zero is performed by a third pusher that is located at 3 and goes through the crown. It is the first time I see such a chronograph.

Pushers

Neither the caliber (see below) not the dial (refinished) can help me to get more information about this chronograph.

Caliber


I would be very grateful if you have any idea about this chronograph.

Thank you,

Marv
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Marv
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Username: Marv

Post Number: 2
Registered: 01-2008

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Posted on Wednesday, January 09, 2008 - 04:08 am:   

Hi,

I should add that the caliber seems to derive from the Landeron 51. Moreover, the frequency (18000 A/h) matches the engraving "1/5 sec".

Marv
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Zaf
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Username: Zaf

Post Number: 3037
Registered: 05-2003

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Posted on Wednesday, January 09, 2008 - 08:01 am:   

It's British, air observation, WWII, 1/5 does indicate the granularity of the of the chronograph fuction, i.e. capable of measurements to with 1/5 of a second. I've had the watch a few times before, either in standard 2 button or 3 button. Sometimes they were also made with the time fuction removed, leaving only the stop watch.
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Bombardier
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Username: Bombardier

Post Number: 27
Registered: 08-2009

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Posted on Monday, September 21, 2009 - 03:55 am:   

I think it may be French. The engraving on the bottom: "FOND ACIER INOXYDABLE" translates from the French to English as "Stainless steel bottom".

Bombardier
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Zaf
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Username: Zaf

Post Number: 4191
Registered: 05-2003

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Posted on Monday, September 21, 2009 - 06:24 am:   

No, it's a Swiss made chrono (thus the French of fond acier inox.) used by the British as denoted by the broad arrow on the dial.