1, Kʻai-yüan Tʻung-pao (開元通寳), 621–907, Tʻang-dynasty bronze coin; 2, Gold coin of Kanishka II, Kushan Empire, 3rd century, obverse; 3, Silver coin of Khosrow II, Sassanian Empire, 6th–7th centuries, obverse. Special exhibition “The Brilliant and Great Tang Dynasty: Substance and Apparatus used in Tang Dynasty from Seventh to Ninth Century” at Shenzhen Museum.
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