I see the Proof Mark, 'BP' surmounted by a Crown or Definitive Birmingham proof 1904, another Proof Mark an 'NP' surmounted by a Crown or Definitive nitro proof 1904 to 1954, another Proof Mark a 'BV' surmounted by a Crown or 1904 to 1954, and 'Date Stamp' Cross Swords with a 'O' or 1934 to 1935.