Serrated edge mirror, Shang dynasty, 15th century BC. Bronze. Diameter 16.3 cm; weight 387 g. Catalog 2. © 2026 Hyogo Prefectural Museum of Ancient Bronze Mirrors

The rim is gear-shaped, and it features distinctive cross-shaped perforations. The opposite side of the photograph has no pattern and is not polished. The presence of the perforations suggests that it was used for a purpose other than a full-length mirror. There is a knob on the pattern.