Platinum Proof One Pound Coin- Double Portrait 70th Wedding Anniversary Invest. The item "Platinum Proof One Pound Coin- Double Portrait 70th Wedding Anniversary Invest" is in sale since Thursday, July 30, 2020. This item is in the category "Coins\Coins\British\Proof Sets/Coins\2000s". The seller is "ersilverster" and is located in Bedford. This item can be shipped to North, South, or Latin America, all countries in Europe, Japan.