Sorry I have no idea. But while I was OK with opening my DW-8140/50/60 watches because they needed battery replacements, now all I have is 2 Kings and 4 Frogs and since they are all solar I'm never planning to open any of them. So whether it's justified or not personally I wouldn't buy an expensive watch like this that has been opened. I'm sure some of my earlier watches 'steamed' up whilst skiing etc. because I had them open at some point though to be fair this is really a guess.
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