1974年哥斯达黎加保育主题50及100科朗银币一对,“海龟”及“海牛”,均NGC PF 69 Ultra Cameo,罕见高分,#497263-003 及 #497263-004. Costa Rica, a pair of silver proof 50 and 100 colones, 1974, Conservation Series, "Sea Turtle" and "Manatee",both graded NGC PF 69 Ultra Cameo, rare high grade, #497263-003 and #497263-004 (2)