A very fine and fairly rare  black hardstone pesesh-kef amulet.

The pesesh-kef was a stone rod with a split curled end and was used in the mortuary “opening of the mouth ceremony.”

Intact.

Un-pierced lug on the rear. Later hard-stone amulets are usually un-pierced.

The pesesh-kef amulet is also found with a pierced loop and often with no loop at all. 

27mm long.

Egyptian, Late Period, circa 500 BC.

The comparative photos are from Petrie's book on amulets