2021, 17.5 Gram Proof Cameroon Silver Venus Coin. Issued in 2021 as part of the Solar System series! Limited mintage of just 555 pieces! Contains 17.5 grams (just over 1/2 Troy oz) of. 999 Fine Silver, with decorative gilding. Face value of 500 CFA (francs) backed by the Republic of Cameroon. Obverse features a magnified color portrait of Venus. Reverse features a coat of arms of Cameroon.