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Well, I buy them directly from Omega and they cost way more than what you are describing, so these are either old stock that Cousins is selling way under the current cost (which would be a bargain and I would buy up all they had for some models) or they are not genuine Omega crystals. It's a bit of both.
You might want to look at the site you posted a little closer...
If you follow your link and then click on the page for Omega crystals by size, the answer is there:
https://www.cousinsuk.com/product/glasses-acrylic-by-size
To show you the relevant text I took this screen shot - these are generic crystals...not Omega:
If I look at the Speedmaster crystal, it is again a generic crystal:
A new genuine Omega crystal would be close to 90 pounds based on Omega's current price. So the few they have that are real are indeed a bargain. These are likely obscure crystals because Cousins has not had access to buy genuine for 10 years now, so this is the left overs.
Looks ok at first glance.
Interesting that you titled the thread DeVille, since the watch is labeled Geneve. I've also seen this reference with a Seamaster 600 dial. And it appears that you included a response to a post from a different thread?
Oh sorry there has been a few watches in this thread, the first one was deville. Is there anything I should look out for specifically with regards to fakes?
The 135.011 looks real to me. The movement probably hasn't been serviced in a while since the caseback gasket is toast.
I found what appears to be the same listing (https://us.vestiairecollective.com/.../omega/white-steel-omega-watch-56385575.shtml) which has the watch priced at ~$1100 USD (before service fees + taxes). So besides evaluating for condition, I'd also recommend searching for comps to get a feel for what the market price should be. The current list is much higher than I'd expect to pay for this example.
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To show you the relevant text I took this screen shot - these are generic crystals...not Omega:
...