Which Sinn UTC models do not have an aluminum bezel insert?

[marchone]

I currently have a 757 UTC and IMO its Achilles Heel is the aluminum bezel insert. If it had a solid Tegimented bezel I'd keep it.

Which Sinn UTC models do not have an aluminum bezel insert? I am looking for a new beater UTC watch with count-up bezel for field use. It will take hard knocks and I don't want an aluminum bezel insert to scratch up. Tegimented of course. Does not have to be Submarine Steel.

Looking at the U2 variants it is confusing in that the base model appears to have a solid Tegimented bezel with no insert while the U2 Schwartz may have an aluminum bezel insert.

Will the Sinn experts please weigh in? Thanks.

[Fantasio]

U2 has Tegimented bezel
U2 SDR has Tegimented and PVD'ed bezel.