World’s most valuable stamp, the British Guiana ( Guyana) 1856 One-Cent Magenta sold for $8.3m to British Dealer
Price tag for the British Guiana 1856 One-Cent Magenta is more than a third of Stanley Gibbons market capitalisation The world’s most valuable stamp has been bought for $8.3m by Stanley Gibbons, which plans to offer investors a chance to
