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Actually

 

my JLC Master Home Time did just as well. I'm sure it's the very favorable temperature these past few weeks, 23-32C max..
In Thailand recently, temperatures of 35+ in the day time, the JLC picked up 6 secs in 4 weeks.
On the UN Marine Chrono: the 118 movement is very stable so far.
And, yes, it was off by exactly 24 hrs, but adjusting the date does not change the time!

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