Can`t say I have ever seen a 3186 in a 16710, in fact yesterday I had a Z serial 16710 to work on and it had a 3185 in it.
The 3185 movement ceased production early/mid last year aorund the time that the 116710
SS GMTII ceramic was launched. It would be logical to asume that any 16570`s produced after that date would have 3186 movements in them.
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