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I ended up with a Sinn EZM3

 

for high altitude climbing because of its cold-related features. It has a few modifications besides the usual cold-temperature oils; a copper-sulphate capsule and argon gas injected into the case. These are intended to displace/absorb moisture, which can be disastrous to a watch in ultra cold situations. Being a reasonable size, it didn't interfere with clothing, but a titanium case would have been better still.



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