What time is it? Watches and horology

Well their "special" silver alloy hasn't done so well at resisting staining/corrosion, it seems.

Wonder if it's just the same as their regular BB "aluminium bronze". The rest of the watch looks very similar.

https://www.hodinkee.com/articles/the-patina-diaries-living-with-the-tudor-black-bay-bronze

Though:

The back of the case is PVD coated stainless steel, in order to prevent excessive skin staining

So maybe they'd have to do something different for a bronze bracelet.