Unusual Round Bronze Mirror

An unusual round bronze mirror, the center with a raised pierced nub enclosed by concentric circles. Decorated with three animals and three "T" forms, set against a ground comprised of patterned striated areas repeated and each with a small raised seed-like nub.
From China’s Warring States era.
Diameter: 21.3 cm.
Thickness: 1.0 cm.
CM004