Interesting. So the 24 h hand did move whilst changing timezones? I do not remember if it was sheldonsmith or tahoeblue that concluded that the wiggle test is not enough to conclude that you have a 3186. What most likely is true is that IF the 24 h hand do NOT move you can be pretty certain (but not totally ;-)) you have the 3186, but if it moves you can have the 3185 OR the 3186, as obviously proven by TempoKing. So "non-wiggle" = 3186, "wiggle" = says nothing...
Just to make sure though. The minute hand seems to wiggle slightly on both 3186 and 3185, whilst the 24 h hand seems to be absolutely still.
Perhaps I have to pop my M-serial ExII (with no wiggle) open anyway... I am curious on the possibility to find more facts.
What I do have hard to believe is Rolex "testing" the 3186 in a series of 16710 before rolling them out in 116710. In that case they should have rolled them out a year or so before the 18k GMT-IIc was launched (which was first to use the 3186), and if that was the case this issue would have been discussed a long time ago, having 16710s from 2005 or so equipped with 3186.
Best,
A
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