Misterious about the Omega balance wheel

Dear all,

I have write to Omega to ask about the balance wheel in my Omega deville 8500b, but the answer was misterious (for a misterious reason I think). Here is their answer: The exact alloy which is used for the balance wheel is kept secret by our specialists. However, we can say: It is a specific material made of non-ferromagnetic alloys and covered with a black PVD coating. Kind regards, Your Omega team.

So I know nothing more. I was thinking that the material used for the balance wheel is a nickel-phosphorus alloy, but know not for sure. The PVD coating is kept secret also, but I would like to know what coating that is.

So I hope you can tell me what the balance wheel (and coating) is made of in the 8500 (Si14)

Kind regards,
Arno

I think it may be made of Uru.

It's been mentioned in several articles that it's titanium but not sure if that's accurate. Would make sense though.

😁 Someone must know, someone can tell. Lets make it a public secret 😀

Found today a site who stated in 2010 that the escapement wheel is indeed made of a nickel-phosphorus alloy suggested in my post above. Further I found that Rolex uses this alloy too for their balance wheel. The balance wheel in the Omega 8500 is made of Decaflor (Cu-Ni-Sn alloy). Why so misterious?

https://www.dzwatches.com/omega-launches-industry-leading-movement-production-line-in-grunchen/

The balance wheel of the 8500 seems to have a DLC coating.