This is a 1981 Great Wall one-yuan coin certified by the internationally renowned grading agency NGC (Numismatic Guaranty Corporation), graded MS 66 (Uncirculated, Top Fine). Issuance Background: Belongs to the "Great Wall Series" of the third set of Chinese Renminbi coins. 1981 was the year with the largest mintage of this series of one-yuan coins (75.45 million uncirculated coins). Material and Specifications: Cast in copper-nickel alloy, 30 mm in diameter, weighing approximately 9.3 grams. Obverse: National emblem, the name of the People's Republic of China, and the year "1981". Reverse: A majestic image of the Great Wall, with the denomination "One Yuan" below. Grading Significance: NGC MS 66 indicates that this coin is in near-perfect uncirculated condition, with almost no flaws, belonging to the "Top Fine" category in the collector's market. Its authenticity and condition have been authoritatively verified.