A series of signed and autographed letters by Mahatma Gandhi and Jawaharlal Nehru and some documents and postcards will figure in a Christie's sale here on July 14.

Three of Gandhi's autographed letters to Islamic scholar and leading figure in the Khilafat movement, Maulana Abdul Bari, in Urdu have an estimated price of 2,500-3,000 pounds (Rs 1.99-2.38 lakh). They refer to Hindu-Muslim relations, including communal tension in Lucknow and their personal friendship.