Probably from the 1930’s.

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Please help me identify this watch.
It used to belong to my grandfather born in 1910.
 
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Can you open the dust cover to take a photo of the movement? It would also be good if you could take clear photos in natural, indirect light.
 
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Going by case serial (5418067) it could be from 1913 to 1918 period.
 
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Can you open the dust cover to take a photo of the movement? It would also be good if you could take clear photos in natural, indirect light.
I am trying to open the cover but I am not having much success. Any tips?
 
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I am trying to open the cover but I am not having much success. Any tips?

Check to see if the inner cover has a hinge where the outer cover is. Then look for a small gap on the crown side of the cover, it may be off to one side of the crown. Insert a fine blade and work it gently to wedge the cover open enough to insert a thicker blade, like a cheese knife.

If the cover has no hinge, it may be a snap on cover, in that case, use the same approach.
Also if it has no hinge, it may be a screw-on cover, but this would be unusual.
 
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It looks like it has a 37.5, with fifteen jewels. A clear picture of the serial number will help us narrow down the year. If you measure the diameter of the movement that'll also help us pin down the model.
Edited:
 
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It looks like it has a 37.5, with fifteen jewels. A clear picture of the serial number will help us narrow down the year. If you measure the diameter of the movement that'll also help us pin down the model.

Probably a bit early for a 37.5 and the barrel bridge is the wrong shape.

As you said, a clear pic of the serial and the dimension of the movement will help a lot.
 
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Probably a bit early for a 37.5 and the barrel bridge is the wrong shape.

As you said, a clear pic of the serial and the dimension of the movement will help a lot.
Are you thinking it's possibly a 19 ligne? I thought that the early 37.5 had the smooth circular curve on the end of barrel bridge like the 19 ligne.
 
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4.6 million serial number places it around 1914 or 1915. That size is larger than I expected. A 19 ligne should be about 1.68," a 37.5 (which I suspected it was when I thought it was from the thirties) should be about 1.4." Those were the two movements I thought you'd would turn out to be. So I'm not sure what movement it is. I'll try and do some digging.
Edited:
 
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Are you thinking it's possibly a 19 ligne? I thought that the early 37.5 had the smooth circular curve on the end of barrel bridge like the 19 ligne.

The 37.5 had a different shape on the end of the barrel bridge, and also, the train layout is different.



I agree it's probably a 19''' variant, but to be sure we need an accurate measurement of the main plate and a shot of the keyless works.
 
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Thanks for the illustration. Did all the 37.5 calibers have the same layout? My understanding was that the 37.5 (140) had the same layout as the 19L. Could it be that some of these that I've seen referred to as 37.5 140 calibers are just mislabeled 19L calibers?
 
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Do you think that the watch has any value, other than sentimental? Is it worth restoring it?
 
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The dial is in really rough shape, the case is missing the bow, the crystal is broken. I think sorting this watch out would cost as much as the watch is worth.