Can you identify this (possibly c. 1915 - 1923) vintage Omega chronograph wristwatch I inherited?

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Hi all,

I'm new to the forum. I inherited this watch from a dear family friend, and can't find out much about it. It's a wristwatch despite being huge and looking like a pocket watch - the wire lugs on one side have just broken off. I'm hoping one of you experts can help tell me a little more about it.

So far I can only find this article on Hondikee with a similar looking Omega (same lugs, same mono-pusher) which interestingly states that "many believe this reference to be the earliest Omega wrist chronograph, ever" (referring to the watch in the article).

However Omega also came out with this watch which is also similar, supposedly modeled after their first chronograph, and was limited to 18 pieces at $122k each in 2018. interestingly, this one has the same lugs, exact same dial layout (but very different dial), same mono-pusher, etc, but I still can't find out anything about the "originals" they were modeled after, and if what I have is one of them or not.

I tried to get all the identifying marks in the photos, but things to note are that the case is ~45mm, inside the caseback there's a "5673478", as well as a "17" below but kind of spaced apart, and below that a "c". Above the Omega logo and those inscriptions is another stamp that as best as I can tell reads "Depose No.9846". The inscription underneath the balance wheel on the movement is "4636344".
 
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Holy shit, so is this actually valuable? I still haven't been able to find any examples that share the same dial as this one — all the ones I've seen so far have the aviator style Arabic numerals and this one has Roman numerals.

Do you think it's worth ordering an extract of the archives?

Also, if I get it repaired, what would be the no-nos in terms of getting it cleaned too? The crystal is very yellowed, would it be bad if I got it replaced, and/or had the hands cleaned?

Thank you so much for the info and other examples!
 
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Also, if I get it repaired, what would be the no-nos in terms of getting it cleaned too? The crystal is very yellowed, would it be bad if I got it replaced, and/or had the hands cleaned?

I wouldn't be thinking of having anything done to the watch. I would slow down and simply keep researching it.
 
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Look for a good watchmaker who is familiar with vintage watches and have it cleaned and lubricated.

I am sure he could also remove the rust from the steel parts and source a new chronograph second hand (yours is snapped off). The case repair is a minor challenge.

You can have the yellowed crystal replaced for a more pleasant appearance of the watch but keep the old crystal!
 
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I am sure he could also remove the rust from the steel parts and source a new chronograph second hand (yours is snapped off). The case repair is a minor challenge.

Good idea, thanks. I hadn't even noticed the chronograph second hand had snapped off, it seems like it had been repaired at some point so that the opposite end that remained was rotated to reset to zero.
 
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Don`t send it to Omega. You will get it back looking like this....

Can I send any old watch to Omega and get one of those back?
 
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Sure. Problem is that it will cost you 10k 😀