Country: Sierra Leone Year: 1987 Denomination: 10 Leones Series: World Wildlife Fund (WWF) Subject: Pygmy Hippopotamus Reverse: Dr. Joseph Saidu Momoh Material: .925 Silver Weight: 28.28 g Certification: PCGS Grade: PR70DCAM (Proof 70 Deep Cameo) Description: A stunning 1987 silver proof coin from Sierra Leone, part of the official WWF series. This coin features the Pygmy Hippopotamus. It has been professionally graded by PCGS and achieved the perfect grade of PR70DCAM. This is the highest grade possible ("Top Pop"), indicating a flawless coin with exceptional contrast between the frosted design and the deep mirror-like fields.