crown wanted for 1937 trench watch

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hi, I've lost the crown from my 9ct gold 1937 Longines trench watch serial number 5518872 - any ideas where I might get one please, or even how I find the size, pattern and thread?

 
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I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M
 
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I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M
I actually just bought a near identical example, in what seems to be very original condition, right down to original strap and buckle. If the crown on mine is original, then it appears identical to the one used on 13ZN examples in the same period, as well as early 30CH watches. If so, they’re quite expensive but occasionally turn up: https://ebay.us/m/YavCOS

No guarantees it will fit, but perhaps an idea worth digging into further.

-Juergen

 
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I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M
hi, thanks for your response. I've attached another photo but having difficulty with reflective light and close-up focus. The stem appears to be still there - it's just the crown which has become loose and unthreaded itself from the end of the stem.

 
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I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M
The diameter of the movement measured inside the case is 27mm
 
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hi, thanks for your response. I've attached another photo but having difficulty with reflective light and close-up focus. The stem appears to be still there - it's just the crown which has become loose and unthreaded itself from the end of the stem.

So either you need a new crown, a new stem, or both.
 
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The diameter of the movement measured inside the case is 27mm
the link you sent is for a series launched in 1942 although the serial number of mine and the hall mark indicate the watch was made in 1937.
 
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I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M
down by the flywheel it is engraved with '27' followed by a smaller '0' or perhaps'9'
 
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So either you need a new crown, a new stem, or both.
it's the crown I've lost but I need a spec for the diameter and thread on the existing stem as well as any 'shoulder/stub' or whatever the correct term is, on the replacement crown.
 
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It’s 27.O with an O as in the French word «Or » - which means « gold ». It is a 12.68Z variant which Longines used with gold watches.

According to Patrick Linder’s authoritative book on Longines movements, published by Longines, this movement was first made in 1929.

27M is yet another - thinner —variant, based on the 27.O. The bridges look the same as 27.O, so the movements look identical.

The 27M was first produced in 1944 to accommodate demand from the American market- which accounted for half of Longines’s production in 1942.
M stands for « mince », which means « thin » in French.

Sorry, with all that I’m not sure how to help regarding your crown. it’s a nice watch; a real pity you lost it.
Perhaps try to contact Obsolete Watch Parts in the UK?
You would really need to find watchmakers who specialize in restoring old watches and who might have parts that fit.
Edited:
 
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It’s 27.O with an O as in the French word «Or » - which means « gold ». It is a 12.68Z variant which Longines used with gold watches.

According to Patrick Linder’s authoritative book on Longines movements, published by Longines, this movement was first made in 1929.

27M is yet another - thinner —variant, based on the 27.O. The bridges look the same as 27.O, so the movements look identical.

The 27M was first produced in 1944 to accommodate demand from the American market- which accounted for half of Longines’s production in 1942.
M stands for « mince », which means « thin » in French.

Sorry, with all that I’m not sure how to help regarding your crown. it’s a nice watch; a real pity you lost it.
Perhaps try to contact Obsolete Watch Parts in the UK?
You would really need to find watchmakers who specialize in restoring old watches and who might have parts that fit.
Welcome back Sylvie, perfect example of why your contributions have been missed.
 
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Thanks @Dan S for the kind appreciation, don’t mind me I’m just passing by 😜

Unfortunately I don’t have much time for horology these days, but always a pleasure to be in touch.
 
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I actually just bought a near identical example, in what seems to be very original condition, right down to original strap and buckle. If the crown on mine is original, then it appears identical to the one used on 13ZN examples in the same period, as well as early 30CH watches. If so, they’re quite expensive but occasionally turn up: https://ebay.us/m/YavCOS

No guarantees it will fit, but perhaps an idea worth digging into further.

-Juergen

pS this is a lovely watch too, and with a beautiful crown.
I would caution against the assumption that a similar looking 13ZN crown would fit the OP’s movement.

One of my pals who commissioned beautiful and well regarded repro steel crowns for the WWII British military Longines 6B/159 non Weems and the Longines Weems found out they’re not interchangeable despite looking identical, for the same movement.
From what I remember there are differences in the stems.

That being said, his advice might be useful if perhaps the OP @[email protected]. would lik to commission a custom repro crown from a third party, even though it might be a bit of a project.

His name is Antoine on the Military Watch Ressource Forum, or Latriaz on Ebay.
https://www.ebay.fr/itm/195949356205?_skw=longines+weems+crown&itmmeta=01KEFP3XPNGF6PC59VHYZPWFYR&hash=item2d9f7de4ad:g:EW8AAOSwZnZk5wFP&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1e7bospGJzwthdymvQWtEgz0FzQaudcy3LSeHndnfyug1xgGuqIsqlrPNgHBAh9vTAp/nr5TXBShjemLdIYMsDl7q4dMW0WIkHXQm9hqW/XE/l84vgL/EzH7SCWBuK8MJhVLQPqai9MHzcXUk9e7VfVfJcmBGYd6tUgjH/2GVrUMEQdWiK/TqbF1mzpVFWkQBP+zJOmSY1I78JXm+wc+jiHs88V78TtSvPT+2BCTIKIF1/XhY98oMSaqAHyS5Volxc=|tkp:Bk9SR7zbj_bzZg
Edited:
 
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pS this is a lovely watch too, and with a beautiful crown.
I would caution against the assumption that a similar looking 13ZN crown would fit the OP’s movement.

One of my pals who commissioned beautiful and well regarded repro steel crowns for the WWII British military Longines 6B/159 non Weems and the Longines Weems found out they’re not interchangeable despite looking identical, for the same movement.
From what I remember there are differences in the stems.

That being said, his advice might be useful if perhaps the OP @[email protected]. would lik to commission a custom repro crown from a third party, even though it might be a bit of a project.

His name is Antoine on the Military Watch Ressource Forum, or Latriaz on Ebay.
https://www.ebay.fr/itm/195949356205?_skw=longines+weems+crown&itmmeta=01KEFP3XPNGF6PC59VHYZPWFYR&hash=item2d9f7de4ad:g:EW8AAOSwZnZk5wFP&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1e7bospGJzwthdymvQWtEgz0FzQaudcy3LSeHndnfyug1xgGuqIsqlrPNgHBAh9vTAp/nr5TXBShjemLdIYMsDl7q4dMW0WIkHXQm9hqW/XE/l84vgL/EzH7SCWBuK8MJhVLQPqai9MHzcXUk9e7VfVfJcmBGYd6tUgjH/2GVrUMEQdWiK/TqbF1mzpVFWkQBP+zJOmSY1I78JXm+wc+jiHs88V78TtSvPT+2BCTIKIF1/XhY98oMSaqAHyS5Volxc=|tkp:Bk9SR7zbj_bzZg

@Syrte , I will confirm your cautionary advice that a 13zn crown would fit! I just compared my the crown on this 27.0 to a 13ZN/30CH crown of the same style, and they are wildly different in size, despite their identical proportions!
 
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pS this is a lovely watch too, and with a beautiful crown.
I would caution against the assumption that a similar looking 13ZN crown would fit the OP’s movement.

One of my pals who commissioned beautiful and well regarded repro steel crowns for the WWII British military Longines 6B/159 non Weems and the Longines Weems found out they’re not interchangeable despite looking identical, for the same movement.
From what I remember there are differences in the stems.

That being said, his advice might be useful if perhaps the OP @[email protected]. would lik to commission a custom repro crown from a third party, even though it might be a bit of a project.

His name is Antoine on the Military Watch Ressource Forum, or Latriaz on Ebay.
https://www.ebay.fr/itm/195949356205?_skw=longines+weems+crown&itmmeta=01KEFP3XPNGF6PC59VHYZPWFYR&hash=item2d9f7de4ad:g:EW8AAOSwZnZk5wFP&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1e7bospGJzwthdymvQWtEgz0FzQaudcy3LSeHndnfyug1xgGuqIsqlrPNgHBAh9vTAp/nr5TXBShjemLdIYMsDl7q4dMW0WIkHXQm9hqW/XE/l84vgL/EzH7SCWBuK8MJhVLQPqai9MHzcXUk9e7VfVfJcmBGYd6tUgjH/2GVrUMEQdWiK/TqbF1mzpVFWkQBP+zJOmSY1I78JXm+wc+jiHs88V78TtSvPT+2BCTIKIF1/XhY98oMSaqAHyS5Volxc=|tkp:Bk9SR7zbj_bzZg

Thank you very much for this and your earlier post which I had missed (not getting notifications for some reason). regards, Colin.
 
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