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I think you might want to reconsider the translation. What Wenjer said was right. 开元 is just one period of the Tang dynasty. If you say Tang-dynasty coin, it would include many species from different period which would be confusing.
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6 mins confidence: peer agreement (net): +1
Explanation: kaiyuan Tongbao(开元通宝)
yuzouren Japan Local time: 16:57 Native speaker of: Chinese PRO pts in category: 4