Well, honey, you grab yourself a trusty ol' caliper, the kind that can measure thickness down to the millimeter. Gently place that coin between the jaws of the caliper and give it a little squeeze to get an accurate reading. Just make sure you don't go all Hulk on it and squish the poor thing flat!
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3 mm
get a tape measure or a ruler and measure it
millimeters
i think it is mm
9cmvmd