What can you tell me about my gold Omega De Ville Prestige?

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Hello Omega Forums,

I bought this gold Omega on an impulse in October after first getting into the hobby. The watch has grown on me and it has become my favorite watch. I bought it on Chrono24 from a Jeweler in the Netherlands who has a store front I assumed that was good enough credentials. The price seemed right. It was listed for less than this but after shipping and taxes and everything, the grand total cost to me was exactly $2001. I've done some research on my own but I was hoping it would be all right if I reached out to you fine folk to ask to confirm what I found in my amateur research and if there is anything else you could le me know.

I've attached the listing photo and a photo I took. My questions

1. The listing says Ref No. 3006 but I suspect that is the Jeweler's internal listing. Is this reference 168.1050 or 4300.31.00 or something else? I placed the links to these references below. Neither of them are 18k gold so I am not 100% certain either of these match. The watch only says Omega and I guessed it was a De Ville Prestige but I'm not 100% certain.

https://www.omegawatches.com/en-us/watch-omega-de-ville-prestige-st-168-1050
https://www.omegawatches.com/en-us/watch-omega-de-ville-prestige-43003100

2. The listing says 2007 but the links above say this model could be from 1994. I plugged the serial number on the caseback into https://serial-number-decoder.com/omega/omega.htm and it says the watch was made in 2006. I can trust this, right? That makes this watch 16 years old and perhaps its model is 28 years old and I wasn't sure if this post belonged here or in the Modern Omega forum.

3. What is the movement of the watch? Is it 1120? The links above say it could be 1109 or 1120 but I'm not sure if I got the reference right. Is this a good movement? Can any watchmaker service this? Its a Chronometer and I'm blown away about how accurate it is compared to my other cheaper watches. I've noticed it is less than +5 seconds a day, compared to an ETA movement watch I have which is nearly +30. That is contributing to my belief that this is a genuine watch and not replica as I would guess a replica watch wouldn't be this accurate. This movement is not co-axial, correct? I don't know when the last time it was serviced. I guess I should get it serviced in say 5 years or if it starts to have an issue?

4. The listing says this is a Sapphire glass. This would be my only watch with sapphire. That is true, isn't it?

5. It has some dings and dents and scratches. There's one dent in particular at 12 o'clock that bugs me. I shouldn't get this polished, should I? I'm tempted to get it polished just once now that it is my watch, and then never again. But I've read one should avoid that.

6. The strap is Omega stamped on the back, and the buckle is also Omega stamped. Is the buckle gold or gold plated? Would it be a sin to replace the strap? Shouldn't I replace it after it is worn anyway? I would have a hard time finding an aftermarket strap that is 19mm, gold buckle, and short length (I had to have a local jeweler punch another hole in it to fit me. Small wrists).

Anything else you can tell me about this watch is appreciated. Thank you for taking the time to read my beginner's post.
 
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It's an 1120 and looks correct to me. I do not believe you have anything to worry about. I have one myself in stainless with a bracelet.
 
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Yours is a nice example of the De Ville Prestige Chronometer, cal 1120, which is an ETA chronometer movement. I have the same model in 18k from 2006, and like to wear it from time to time as a dress watch. Like yours, it has proved very accurate - my watchmaker said the 1120 movement was a very good one. As for servicing, any established watchmaker will take care of it - but as the movement is accessed from the front, they need the equipment to do that, so don't give it to a backyard watchmaker. (You can take it to an Omega dealer, but you will pay a lot more than most of us on this Forum think is necessary for a basic service).
Don't give it to anyone for polishing (ever!). You can use a silver polishing cloth to take out minor scratches: the main thing is to preserve the case sharp edges, as every time you polish any gold case a little metal s removed. By carefully cleaning the surface with a silver cloth you will keep it looking good.
The glass is sapphire. The buckle will be gold plated. When you need a new strap just transfer the buckle to it. Of course any Omega agent will happily supply and fit a new Omega strap, but the price will shock you. I suggest that when you need to change it, you look for a good quality aftermarket strap at any retail watch shop (who will change it over for you), or from an established seller online, and change the buckle over yourself.
I think this covers your questions. Mine says hello. By the way, the price you paid was fine - they often have much higher tags on them.
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This doesn't look like a vintage reference. You might do better asking this on the modern Omega sub.