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The silver is mixed with aluminium to apparently maintain its brightness and not tarnish as normal. The thing that I think will effect this, is things like hand sanitiser that is used constantly right now. The amount of different chemicals for each brand, you haven't really got a chance that one of them won't tarnish this watch over time. I think its slightly bad timing on Tudors part.
I don't know why I'm interested in this, but...
https://www.youtube.com/watch?v=vRL6waR9RW0