I think it's when a copy from a mold of each side of a coin is made...and the two halves are joined together often revealing an edge seam.
edit >>> A quick and somewhat simplified(but accurate enough... I 'spose) definition from google...
Quote: A duplicate coin created by the electrolytic method, where metal is deposited into a mold made from the original. The obverse and reverse metal shells are then filled with metal and fused together.
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