Archimedes Limited Edition: Automatic Carré & Jumping Hour
18K Pink Gold

Like the Perpetual Calendar the Jumping Hour (top) and the Rectangular Automatic...
show discolorations. It looks like the copper part of the pink gold started to oxidize. I have worn the Jumping Hour more then the Automatic. That could be an indication that sweat aggressively worked on the pink gold. I will have to ask our jewelers for advice on

I am not overly worried because I think this tarnish could be easily cleaned. And since those are 18K watches, I might have to leave this to a professional.