此枚为唐高祖武德四年（公元 621 年）始铸开元通宝，是唐代最主流流通方孔圆钱。钱文 “开元通宝” 由初唐大书法家欧阳询书写，隶书字体端庄秀丽，开创后世 “通宝” 钱币命名体系，在中国钱币史上拥有里程碑意义。 钱币背面上方铸有仰月纹饰（背上月），为开元通宝最为常见的经典版式。钱币经公博（GBCA）评级封装，评定极美品；规格直径 25.0mm，厚度 1.2mm，重 3.6g。钱币通体温润传世老包浆，文字清晰，形制规整，流通磨损自然，保存状态佳，是大唐盛世重要的实物历史遗存。

This coin is Kaiyuan Tongbao, first minted in the 4th year of Wude reign (621 A.D.) during the reign of Emperor Gaozu of Tang. It was the primary circulating square-hole copper coin throughout the Tang Dynasty. The inscription "Kaiyuan Tongbao" was written by Ouyang Xun, a renowned calligrapher of early Tang Dynasty. Its official clerical script established the naming convention of "Tongbao" coinage that influenced Chinese currency for over a thousand years, marking a milestone in Chinese numismatic history. An upward crescent symbol is cast at the top on the coin’s reverse, representing one of the most classic varieties of Kaiyuan Tongbao. Certified and encapsulated by GBCA (Gongbo Historical Coins Authentication), graded Extra Fine. Specifications: Diameter 25.0 mm, thickness 1.2 mm, weight 3.6 g. The coin is covered with natural aged patina. Characters remain distinct with well-defined shape and moderate circulation wear. Well-preserved, it serves as authentic physical relic reflecting the prosperous Tang Dynasty.