Early longines keywind

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Measures 45.1mm across the dial. I'm told it's around 1870ish going off the 23311 serial number. Where would I go about getting a bezel and crystal for this?

 
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The true and correct serial number of the watch is actually under the dial for this watch. I don't think you should use the number on the case since it could have belonged to a different watch. Also, the hands on your watch do not match, you have at least two different hand sets, maybe even three? You need to look for the pins that hold the dial feet to the movement and carefully pull them out of the eyelets to remove the dial. Of course before doing anything, you need to remove the hands and then remove the dial. I hope you have needle nose tweezers to work with.
 
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I sort of believe the number 3 font on the case is not normal for a Longines watch of that era if that case was made by Longines. I think it is not a factory case.
 
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I have it sent off to a watchmaker to get it serviced and get the serial number off the movement
 
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What is that watch? It looks to be of the same era. I'm new to old pocket watches
It is the same as yours but a couple of years newer. Ref 2859 ?
 
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It is about 1870-1872. Same as yours. Note, mine is all proper. Hands, movement, case, dial are all Longines.
 
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It is about 1870-1872. Same as yours
What's the value on a longines of this vintage? I'm not selling but I am curious
 
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What's the value on a longines of this vintage? I'm not selling but I am curious

If only the movement is original then about $100 on a good day
 
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If in good condition and all original with extract and ultra low serial numbers below 1,000. $3,000-5,000. The museum paid about $5,000 each for just the parts for #335 and #561, and gave the donor two new high end Longines watches. So compensation was about $8,000 per pile of parts, which they made missing pieces and restored beautifully. Serial 183 is all original extra fine condition and it is running and accurate the last time I wound it up. All the original parts from 1867 are on the watch. Extremely rare condition for world's oldest trade marked object of any kind from any country according to the World Trade Organization. Value unknown. It was awarded $40,000 and the collector can keep the watch until dead at which time it goes to Longines.
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Serial number 3166 that won Germany cost the owner quite an investment due to it's originality and cost of restoration.
 
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Serial #347 sold initially for $3000. The bidder did not pay due to case serial number does not match the movement. All parts Longines made if I remember correctly.
 
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If my serial number matches my case I would have something valuable, otherwise it's a nice watch for special occasions
 
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I have it sent off to a watchmaker to get it serviced and get the serial number off the movement
Here is another 20B. Even though I'm pretty sure that the case was not made by Longines, there are matching numbers case/movement (18007).
Same with some other private brand Longines. I assume that most 20B and 16D were shipped to the US without case, so I wouldn't say that it is not original.
 
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Here is another 20B. Even though I'm pretty sure that the case was not made by Longines, there are matching numbers case/movement (18007).
Same with some other private brand Longines. I assume that most 20B and 16D were shipped to the US without case, so I wouldn't say that it is not original.
Are you sure that isn't a Longines made case? It sure looks like one made in the style of a Longines case. Have you asked Longines? I don't know the answer, but it certainly looks like one of the case suppliers used by Longines and the engraving style is very much same as Longines. Do you see the "Illumination" of the capital letters is an empty outline on top half of the letter. The bottom half of the letter is filled in. There is a heart shaped figure that divides the top half of the letter and the bottom half of the letters. And the fancy swirls around the letters. Does it not resemble the other AA4 case engravings? Not to forget the surounding metal file looking diamond patterns. There would have been only a couple of people in the factory doing this type of engraving so there is a "style" to it that helps identify that it most likely was the same Longines engraver that did this.
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If my serial number matches my case I would have something valuable, otherwise it's a nice watch for special occasions
Key winder Longines of any kind are not that easy to come by.
 
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Are you sure that isn't a Longines made case? It sure looks like one made in the style of a Longines case. Have you asked Longines? I don't know the answer, but it certainly looks like one of the case suppliers used by Longines and the engraving style is very much same as Longines. Do you see the "Illumination" of the capital letters is an empty outline on top half of the letter. The bottom half of the letter is filled in. There is a heart shaped figure that divides the top half of the letter and the bottom half of the letters. And the fancy swirls around the letters. Does it not resemble the other AA4 case engravings? Not to forget the surounding metal file looking diamond patterns. There would have been only a couple of people in the factory doing this type of engraving so there is a "style" to it that helps identify that it most likely was the same Longines engraver that did this.
Indeed - I noticed the similarities on the inner lid when I saw the pics of your example.
Mine has an "FM"-Logo on the case, so I thought that's from a local maker. The watch itself has "Longines" on the movement, but not on the dial. No, I didn't ask Longines for the extract, it costs almost what I paid for this watch 🙂