(3) This Article shall be deemed to have superseded, on and after the first day of January, 1945, as to United States tax, and on and after the 6th day of April, 1945, as to United Kingdom tax, the arrangements relating to reciprocal exemption of shipping profits from income tax effected between the Government of the United States and the Government of the United Kingdom by exchange of Notes dated August 11, 1924, November 18, 1924, November 26, 1924, January 15, 1925, February 13, 1925, and March 16, 1925, which shall accordingly cease to have effect.