Earliest serial number for caliber 321

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Another one, that is not so much overexposed, thanks
Thank you. The movement seems mostly correct (I will be more explicit later) but, unfortunately, the balance wheel is swinging and, on account of the motion, it cannot be assessed.
 
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I added 2 pictures with a non swinging balance wheel and 2 pictures where you can see the writing of the movement type below the balance wheel (CHRO C12). Currently I don‘t have more, I hope they fit. Otherwise I would need to open the watch in the upcoming days.
 
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I added 2 pictures with a non swinging balance wheel and 2 pictures where you can see the writing of the movement type below the balance wheel (CHRO C12). Currently I don‘t have more, I hope they fit. Otherwise I would need to open the watch in the upcoming days.
Thank you. Unfortunately from these pictures I am still unable to see if the balance wheel is of the cut type or not.
In fact, such an early example should carry a cut balance wheel in absence of shock absorber. However, the fact that the regulator arm shows a more recent rhomboidal shape instead of the correct triangular one might suggest that the balance wheel-hairspring group has been replaced at some point during the life of the watch.
 
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Thank you. On the first picture it looks a little bit like a cut balance wheel, but it is not sharp. The service history is unknown to me. I am going to make some more pictures mid of the week. Beside the balance wheel, what do you think?
 
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Thank you. On the first picture it looks a little bit like a cut balance wheel, but it is not sharp. The service history is unknown to me. I am going to make some more pictures mid of the week. Beside the balance wheel, what do you think?
I personally like these very early examples very much and I find this particular specimen in reasonable conditions. However, let's see if the balance is cut or not. 😉
 
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I personally like these very early examples very much and I find this particular specimen in reasonable conditions. However, let's see if the balance is cut or not. 😉
I had a chance to make pictures today. I think the pictures are o.k.. For me it looks like the balance has two cuts.
 
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I had a chance to make pictures today. I think the pictures are o.k.. For me it looks like the balance has two cuts.
Yes, it does. Everything (apart from the arm of the regulator) appears original. A nice and very rare example of one of the earliest 27CHRO.
 
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Thank you for your help, I appreciate very much. The movement in the spare parts drawings is less than 25 numbers lower compared to mine. Do you have any information what the lowest sold movement numbers was?
I ordered an extract of the archive but I assume, there will be no information available. Anyway - after more than 80 years and a word-war in between there won‘t be many watches out there anymore with a lower number.
The watch was running 40 hours now, loosing round about 4 minutes per day (more or less exactly). I am looking for a service now in Germany or the EU. If you can suggest someone I would appreciate. I would like to keep it in the original condition and just want to let it run a little bit more precise.
Thanks again

Udo
 
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Thank you for your help, I appreciate very much. The movement in the spare parts drawings is less than 25 numbers lower compared to mine. Do you have any information what the lowest sold movement numbers was?
I ordered an extract of the archive but I assume, there will be no information available. Anyway - after more than 80 years and a word-war in between there won‘t be many watches out there anymore with a lower number.
The watch was running 40 hours now, loosing round about 4 minutes per day (more or less exactly). I am looking for a service now in Germany or the EU. If you can suggest someone I would appreciate. I would like to keep it in the original condition and just want to let it run a little bit more precise.
Thanks again

Udo
To the best of my knowledge, yours is probably the lowest serial number I have never seen or serviced.
With respect to overhauling it, any competent watchmaker should be able to do a good job.
Since you are looking for a EU based watchmaker, I might suggest my friend Aldo, who is very skilled and renowned also on this forum:
http://www.milwatchmaker.com/