World Wildlife Fund.
Some coins exhibit traces of toning. They are all in fitted plastic capsules and are housed in a set of 8 wooden trays which stack together (a couple of trays have some issues such as loose sides). Complete silver proof set of 48 pieces comprising:
Afghanistan - 500 Afghanis 1978 Proof, KM 981, 250 Afghanis 1978 Proof, KM 979.
Botswana - 10 Pula 1978 Proof, KM 12a, 5 Pula 1978 Proof, KM 11a.
Colombia - 750 Pesos 1978 Proof, KM 265, 500 Pesos 1978 Proof, KM 264.
Costa Rica - 100 Colones 1974 Proof, KM 201a, 50 Colones 1974 Proof, KM 200a.
Ethiopia - 25 Birr 1970 Proof, KM 62a, 10 Birr 1970 Proof, KM 61a.
Falkland Islands - 10 Pounds 1979 Proof, KM 12, 5 Pounds 1979 Proof, KM 11.
Fiji - 20 Dollars 1978 Proof, KM 42, 10 Dollars 1978 Proof, KM 41.
Gambia - 40 Dalasis 1977 Proof, KM 18, 20 Dalasis 1977 Proof, KM 17.
Indonesia - 5000 Rupiah 1978 Proof, KM 40a, 2000 Rupiah 1974 Proof, KM 39a.
Jordan - 3 Dinars 1977 Proof, KM 32, 2 1/2 Dinars 1977 Proof, KM 31.
Malaysia - 25 Ringgit 1976 Proof, KM 20, 15 Ringgit 1976 Proof, KM 19.
Malawi - 10 Kwacha 1978 Proof, KM 16, 5 Kwacha 1978 Proof, KM 15.
Mauritius - 50 Rupees 1975 Proof, KM 41a, 25 Rupees 1975 Proof, KM 40a.
Mongolia - 50 Tugrik 1976 Proof, KM 37, 25 Tugrik 1976 Proof, KM 36.
Nepal - 50 Rupee 1974 Proof, KM 841a, 25 Rupee 1974 Proof, KM 839a.
Oman - 5 Omani Rials 1976 Proof, KM 61, 2 1/2 Omani Rials 1976 Proof, KM 60.
Pakistan - 150 Rupees 1976 Proof, KM 42, 100 Rupees 1976 Proof, KM 40.
Tanzania - 50 Shilingi 1974 Proof, KM 8a, 25 Shilingi 1974 Proof, KM 7a.
Thailand - 100 Baht BE 2517 (1974) Proof, KM 103a, 50 Baht BE 2517 (1974) Proof, KM102a.
Venezuela - 50 Bolivares 1975 Proof, KM 47, 25 Bolivares 1975 Proof, KM 46.
Seychelles - 100 Rupees 1978 Proof, KM 40, 50 Rupees 1978 Proof, KM 39.
Sudan - 5 Pounds 1976 Proof, KM 71, 2 1/2 Pounds 1976 Proof, KM 70.
Zaire - 5 Zaires 1975 Proof, KM 10, 2 1/2 Zaires 1975 Proof, KM 9.
Zambia - 10 Kwacha 1979 Proof, KM 19, 5 Kwacha 1979 Proof, KM 18.