Of green-glazed faience, depicting the Red Crown of Lower Egypt, shaped in a low cylinder with a tall back spike and an uncurling spiral projected at the front, connected by a filled-in outline, with a hole drilled for attachment. 

Interestingly, aside from a few early examples carved from carnelian, amulets of this type are usually of green glazed composition, as seen here. These amulets are considered ones of power, as the crown would only have been worn by the pharaoh and certain deities, so such amulets, when placed on the mummy of a commoner, would imbue them with the same aura of power and authority as the pharaoh or deity.  

For a very similar example see:  Boston Museum of Fine Arts, accession #57.504

Ref: Carol Andrews, Amulets of Ancient Egypt, London: British Museum Press (1994) p. 75

Dimensions:  Height:  7/8 inches (2.2 cm)

Condition: With some minor surface wear and deposits, overall intact and in very good condition.

Provenance:  Private NY collection, acquired Christie's in the early 1990s.