“开元通宝”钱,始铸于唐武德四年(公元621年),它的诞生在中国乃至东方货币史上产生了重大的影响。首先,它废除了沿用千余年的钱币计重制,开创了通宝钱体系;其次,创立了新的衡重标准单位—“钱”;“开元通宝”的钱文布局与形制重量,为唐及以后的铸币 “Kaiyuan Tongbao ” money, originally cast in Tang Takenori four years (AD 621), its birth in the history of China and even the East had a significant impact. First of all, it abolished the monetary remeasurement that followed more than a thousand years and created the system of universal currency. Secondly, it created a new standard unit of weighing - “money” and “money and text layout and formation of Kaiyuan Tongbao” Weight, for the Tang and later coins