Duguxin polyhedral coal seal is a cultural relic of the Western Wei Dynasty, which was unearthed in Xunyang County, Shaanxi Province 198 1. Dugu Yinxin is a clean coal seal collected by Shaanxi History Museum.
This seal is 4.5cm high and 4.35cm wide, with 8 edges and 26 spheres, including 18 square faces and 8 triangular faces. There are 14 square seals, namely "Official Letter on Sparse", "Official Letter on Seal", "Official Letter on Form", "Official Seal", "Official Seal", "Secretariat Seal", "Official Letter on White Book" and "Official Letter on White Note". The seal is regular script, the calligraphy is tall and straight, and I have a strong interest in Shu Wei. According to the content of the seal and the textual research of historical books, this seal is the seal of Du Fu in the Western Wei Dynasty. Fourteen seals have different contents and uses, and are valuable physical materials for studying the seal system of the Northern Dynasties.