This is a mirror.
It is from grave D226 at Abydos. It is not clear from the excavation report how many bodies were buried in this tomb. There were three mirrors. Would any of the bodies have been provided with more than one mirror? This is a mirror. It is made from copper alloy. It is at least 3,300 years old, dating to the 18th Dynasty in the New Kingdom (about 1550-1295 BCE).