Very rare high grade chronograph, can't find the manufacturer of the movement

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hello to all members, I have done some research online but I can't get info about the manufacturer of this exceptional movement, the quality and finishes of this movement are amazing. My watch maker has a small brochure with all the hallmarks of each brand but we couldn't find the one stamped on this movement.
Hope some one can help.
thanks,
David
 
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Afaik the cross mark is Brevet, Brevet 31798 gives some results.
 
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Afaik the cross mark is Brevet, Brevet 31798 gives some results.
thanks for the input, now I should find out the caliber reference. I don't see any inscription on the movement a part of the one I already shared .
Also searching online I found out that it's chronograph with minute register and instant jumping minute hand, which is a rare complication
 
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post-859-0-40432600-1400229620.jpg
 
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Hello, finally I got my project done and sharing some pictures here. If you like to see the video where it shows the instant jumping minute hand, here is the link
https://www.instagram.com/p/Ch7J-yqrfrB/
Don't if it's allowed to share insta link at the forum , if not I will remove it. Here some pictures:
 
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what are your thoughts on leaving an open casebook ? sure is not the original and traditional way but in my opinion is very sexy
 
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what are your thoughts on leaving an open casebook ? sure is not the original and traditional way but in my opinion is very sexy
I asked a similar question in my Rusty Heuer thread. I am thinking that display backs really show off these old movements. This one has a really nice finish on it. Of course one needs some protection of the movement as the least amount of dust will cause problems down the road.
-j
 
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I asked a similar question in my Rusty Heuer thread. I am thinking that display backs really show off these old movements. This one has a really nice finish on it. Of course one needs some protection of the movement as the least amount of dust will cause problems down the road.
-j
Thanks for sharing your thoughts, I agree that protecting the movement is very important even do this beauty won’t be a daily wear watch
 
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I like the display back, beautiful movement why not show it off.
 
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I recently had a minute repeater chronograph of the same brand, but unfortunately with a fused case. And mine had the patent 13247 marked under the dial
 
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I recently had a minute repeater chronograph of the same brand, but unfortunately with a fused case. And mine had the patent 13247 marked under the dial
beautiful movement, I do believe that deserves a nice case so you can enjoy