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Caseback Markings

padders
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That may be because it is in 9K so they have used a different lozenge/cartouche to denote the lower purity of gold. Judging by the shape of the S, I would guess yours is marked for 1913. Does that make sense with what else you know of the watch?
Edited:
 
Syrte
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@aap do you know for sure it's a 12.92?
As far as I can tell it also looks like a 13.82 - slightly larger - but same pattern I reckon.
However the size of the watch would typically be larger on a 13.82.
Edited:
 
Canuck
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What threw me on this, until I compared the table listed herein, with the town mark in the case back of the subject watch, is that in the image in the case back of the subject watch, the town mark is upside down. I have long known that was an import mark, but I have just learned that it is an import mark that pertains only to London. Never too old to learn, I guess.
 
JimInOz
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Canuck Canuck
What threw me on this, until I compared the table listed herein, with the town mark in the case back of the subject watch, is that in the image in the case back of the subject watch, the town mark is upside down. I have long known that was an import mark, but I have just learned that it is an import mark that pertains only to London. Never too old to learn, I guess.

Well I know everything about hallmarks and import marks, except for the huge amount that I don't know about 😁.

So just like you, I'm still learning.

I have found DB's site a gold mine for vintage watch info so it should be a cornerstone for anybody interested in the field.
 
Canuck
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I have his site bookmarked. Yes, there is a wealth of information. But I was unable to locate the table (above) on his site. Perhaps if I tried harder.’
 
aap
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Syrte Syrte
@aap do you know for sure it's a 12.92?
As far as I can tell it also looks like a 13.82 - slightly larger - but same pattern I reckon.
However the size of the watch would typically be larger on a 13.82.

Here you go, S:
39935760_536698476787746_8095720762607927296_n (1).jpg


Movement number dates it to around 1929 based on this site: http://www.pocketwatchrepair.com/histories/longines.php
39887101_469118106936642_4894196331364483072_n.jpg


But, the point about 1931 seems to be correct too!
40009478_271029653623384_4969714573826326528_n.jpg
 
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