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Discussion Starter #1
Good day all,

I need some help to date this watch that I have just bought. As far as I know, it is a 18.28.1.P.E movement and serial number is 27474. The case is 507219.
It gains 12 minutes per day.

Best regards and thanks in advance
 

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Zenith Forum Co-moderator
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The dial style is around 1920s. The low serial number suggests that it was assembled in the Zenith dependency Besancon, France, in which case it ought to be after 1923.

Hartmut Richter
 

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Discussion Starter #3
Mr Richter,

thank you for the information. In your opinion, is it worth to service the watch?.
 

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Hi, just looking at your regulator, it's off the balance cock. Maybe try putting it back in the middle (if you feel confident doing that). Sometimes moving them too far, even toward slow, messes up the time. Gaining 12 minutes a day is strange. The watch could have gotten magnetized, or have oil on the hairspring. I say have your local watch repairman take a look at it and see what he says.
 

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Zenith Forum Co-moderator
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It is most certainly worth having the watch serviced if you are going to wear it. Zeniths are some of the best pocket watches that money can buy - nothing as special as Patek so you don't have to pay the earth, yet the essentials for high accuracy (Breguet spring, bimetallic split balance, temperature screws, snail regulator - although yours is missing that last item) are all there. Properly regulated, these things can still perform to within close to ±0 seconds/day and give you great service over years. I was actually wearing mine today.

At the same time, if you aren't going to wear and use it, you might as well delay a service. Worn or unworn, the oils still dry up and after a service, you'll have a maximum of about ten years until it needs the next service. And if it's just going to lie in a drawer for most of that time, you can save the cash.

Hartmut Richter
 

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Discussion Starter #6
Thank you for your responses,

the watch also works for about 10-12 hours and stops. As I have received a beautiful french chain, I have been wearing it for these two days (my first pocket watch) and I like it very much so I will get it serviced asap. 10 years interval from service to service is OK for me.

Regards
 
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