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You will be able to tell easily without removing the back... Find another 16710 at an AD, and try setting the hands. If there is more play on setting the hands than on your Z series, then maybe, perhaps, possibly, there is a 3186 movement in there.
There is a noticeable difference between the amount of play in the hands between both watches. The 3186 movement has the gears closer together removing a lot of this slack.
-Sheldon
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