This Mitanni seal belongs to the "elaborate style" Note the traces of a drill. (ex Malter Galleries)

This is a Mitanni carnelian seal in the so-called "elaborate style", note the animals drilled and cut with a rotating wheel (ex PBJI)

This is a Mitanni frit seal of the "common style" group. (ex Medusa Ancient Art)

A Syro-Hittite cylinder seal, it's made of bronze, a rare occurance. Note the figures, scattered over the seal-surface (ex Hixenbaugh Ancient Art)