The Calcutta flag was one of the first unofficial flags of India. It was designed by Sachindra Prasad Bose and Hemchandra Kanungo and unfurled on 7 August 1906 at Parsi Bagan Square, Calcutta. The "flag of Indian independence", which was hoisted by Madam Bhikaji Cama at the International Socialist conference in Stuttgart, Germany, was based on Calcutta flag.