This is a vintage 6" porcelain plate, made in Japan by Asahi Sato. It is marked on the back.
The plate features a black, not6t blue, lattice design with peacocks and flower artwork, with gold trim. Some of the paint is worn or faded over the half century, or more, since it was made.
The plate represents Japanese culture and has not been modified. No chips or cracks noticeable.