An ancient coin dating back to the tenth century BCE – roughly the time of the reign of King David – was recently discovered by a 10 year old volunteer from Russia who had been participating in the Temple Mount Sifting Project in Jerusalem.No, this was not a coin. Coins were not invented until some centuries after the time of this artifact. It is a seal — a stone object carved with an image (not writing in this case, alas) which is pressed into clay (or later wax). The clay impression is called a "bulla" (plural "bullae) and was used to seal documents shut. You can read about the story here.
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This doesn't seem complicated to me, but this is the second time I've seen this sort of confusion recently. Back in June someone was confusing a Canaanite-era Egyptian scarab seal with a coin. Story here.
