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It does sound like there’s been some water ingress and the seal is compromised. A couple of large bags of silica gel with just the watch head, crown out, face down in a ziplock bag for a week or two will get the components dry. Otherwise take the caseback off and leave it in a warm dry place for a few days. Take care, “warm and dry” is not good for leather.
Perhaps the caseback seal was mis-seated or damaged if the previous owner opened it up or the crown seal was somehow compromised. This is relatively unlikely to be a manufacturing fault IMO.
freddo-
Very fair point re. unlikely it being a manufacturing fault. @Jonte saying it happened to his Khaki Field as well left me curious. Have it in a ziplock bag with rice in as didn't have silica to hand.
Would new seals - paired with a pressure test be the worst case scenario do you reckon?
spunk_nautical
I'm a bit freaked. Cycled to work through some medium - heavy rain and when I got in to office found what seemed to be fine dirt underneath crystal - actually really fine beads of condensation. It was a little worse than the picture below. I took it off and left it sitting on my desk for around two hours at which point it had almost fully disappeared. I put it back on and it started to fog back up again at which point I took the picture below.
Have read five or six different opinions as to what to do - would love if anyone here from experience could weigh in - should I get on to Hamilton?