Autograph Envelope Front, signed ‘D’ lower left, to an address in Savile Row. 5 x 3¼ inches, black border, mounted on part album page (an unrelated free front is on the other side). 11 July 1868. The Earl of Derby became Prime Minister in 1852, 1858-9, and 1866- January 1868. As Colonial Secretary in 1833 he carried the Act for the emancipation of West Indian slaves.