Triangular-rimmed mirror from the North Mound of Nukutani.

A Japanese triangular-rimmed mirror of the gods and animals excavated from the Nukutani Kitazuka burial mound in Kashiwara City (late 4th century). It was produced by the Yamato regime and distributed to various powers, and is an important material for studying the political history of the 4th century, when there was almost no literature. These two pieces are molding mirrors produced from the same mold, and are also valuable as research materials on ancient metalworking techniques.