G'day,
usually i try to avoid cross-linking, but based on a recent question here i´d guess this might be interesting.
As we know, German Silver is apt to "aging"; a sort of tarnishing (oxidation, but not rust in a common sense).
And if you wish to see how it will look in a little more than 100 years down the road, you may have a look here:
http://gp.watchprosite.com/show-forumpost/fi-6/pi-2244136/ti-367846/s-0/
Of course tarnishing can be worked on once your Lange watch comes home for servicing. During SIHH, the Lange staff commented on common practice noting by far most owners sending in their watches much prefer not to remove it.
That´s something i´d perfectly understand; "aged" German Silver is a beautiful tone, which will look different for any piece. In some way, it makes each watch even more unique!
Greetings from Germany,
Peter