Longines 1940/50s 9ct

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Hi all,
it's my first post here and wanted to ask you guys some help with a watch I've just bought and I really like.
First of all, I wanted to know if any of you could identify the movement. It looks like a 12.68Z but it's not as it has only 15 jewels.
I took the watch to the local shop to be serviced and the watchmaker who was an omega specialist replaced the crown with an Omega crown (I know...).
Anybody would know if it's possible to get the original crown somewhere for it?

Thank you, all and have a nice weekend.

 
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Whereabouts do you live? Someone here might be able to recommend a watchmaker who can be of more help to you.
 
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Whereabouts do you live? Someone here might be able to recommend a watchmaker who can be of more help to you.
I live in London
 
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It looks like it could be in a Dennison made case, in which case the crown will be an unmarked, quite generic one, not a Longines one. A pic of the inside of the case back would be helpful. The calibre number is under the balance wheel.
 
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It looks like it could be in a Dennison made case, in which case the crown will be an unmarked, quite generic one, not a Longines one. A pic of the inside of the case back would be helpful. The calibre number is under the balance wheel.
Ok thanks for the information, you are right it seems like a Dennison case. Any idea if those kind of watch are sought after? I guess they are quite of a niche.. I'm asking as I'm wondering if I should put more money it so it get closer to the original.

 
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Looks pretty original to me except the crown, but the one in the mvt pic looks to me closer to what would have been on it originally. They are nice little watches.
 
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The movement is a caliber 12.68Z. This caliber can commonly be found with either 15 or 17 jewels. The serial number of around 7.1 million suggests an original invoice date of around 1947. A few of the features are characteristic of UK-market watches, such as the blued screws on the movement and the curved Longines signature over the sub-dial.
 
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The movement is a caliber 12.68Z. This caliber can commonly be found with either 15 or 17 jewels. The serial number of around 7.1 million suggests an original invoice date of around 1947. A few of the features are characteristic of UK-market watches, such as the blued screws on the movement and the curved Longines signature over the sub-dial.
Thanks for your insight. I bought it in an auction in Oxford. I didn't know the exact date but the old watchmaker in North London who took care of it and seemed to be very knowledgable suggested a date around that too. Just like me the watchmaker really liked the watch. That is a funny thing they can depreciate so much. Who knows, one day some watched who are today out of fashion will make a come back. I'm very new to this but I feel like investing in nice depreciated old watches will be a pleasant hobby for me.
 
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If you look closely, you can see the last two characters of the caliber under the balance in the movement photo.
 
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Thanks for your insight. I bought it in an auction in Oxford. I didn't know the exact date but the old watchmaker in North London who took care of it and seemed to be very knowledgable suggested a date around that too. Just like me the watchmaker really liked the watch. That is a funny thing they can depreciate so much. Who knows, one day some watched who are today out of fashion will make a come back. I'm very new to this but I feel like investing in nice depreciated old watches will be a pleasant hobby for me.
Yeah, the market seems to fluctuate according to various whims. Vintage Longines often represents good value as the quality is comparable (or even superior) to Omega, but prices tend to be lower.