Botswana. Silver Proof Set of 5 and 10 Pula 1978, 15th anniversary of the World Wildlife Fund (WWF), Gemsbok (Silver 38,61 mm, weight 28,50 g. .925) and Klipspringer (Silver 41 mm, weight 35 g. .925), KM 11a, 12a, Condition Proof, original box and certificates, slight tarnish - patina, small spots, photo taken through the plastic in the cap