1991年全民义务植树运动十週年纪念钢芯镀镍币壹圆一套3枚,包括“美化祖国,造福人类”、“全民动员,义务植树”及“治理山河,保护生态”,均为冠军分NGC PF69 Cameo! Peoples Republic of China, [NGC PF69 Cameo] a trio of nickel clad steel proof 1 yuan, 1991, the full Chinese Arbor Day (Tree Planting Festival) commemorative set, Beautify The Future, Planting and Environmental Protection, all graded NGC PF69 Cameo. All NGC TOP POP! cert. #6413402-001, -002, -003 (3)