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Just a clarification - Sinn used to use cases made by Damasko, but this partnership died out quite a while ago. They then developed the tegimentation process which is a very thin surface hardening over softer steel.
All Damasko watches use ice-hardened steel that is fully hardened - not a surface layer - but if you get one in black, it is coated with a layer of Damest - which is their proprietary coating (probably similar to DLC?) - that is very wear/scratch resistant and will stay looking better far longer than a PVD coated watch.
Interesting insight into case hardening techniques, but I wasn't particularly focusing on case hardness per se, rather the difference between the optical effect of folded steel that you get with Damask or Damascus steel and the name of the other watch company (Damasko).
I rather like the effect of Damascus steel on Purdee's products:-
http://www.purdey.com/guns-rifles/damascus-guns/
http://www.purdey.com/clothing-accessories/forester-raindrop-knife---desert-ironwood-knife096.aspx
And apologies to you too - I had seen those Damascus steel Sinn cases the other day, but hadn't clicked on the link in your post, and thus took what you were saying incorrectly.
The Bremont Boeing series has a Trip-Tick casing constructed from aviation proprietary custom 465 Steel treatment which reaches 2000 Vickers of hardness from outer surface all the way through to the inner core....