BTVS "Witch Doctor" mask, often seen in many episodes on the wall behind the counter of The Magic Box.

Although the COA (included) says it's a "Witch Doctor" mask, I researched it thoroughly and learned that  it is actually a Balinese Rangda "Queen of the Demons" mask.

I have included a picture of a repaired crack in the mask, which occurred during filming.

I've also included three screenshots of the mask behind the counter in various BTVS episodes.