Blackmail (1929) New Scotland Yard, Victoria Embankment, London, object and signBlackmail (1929) New Scotland Yard, Victoria Embankment, London, object and signBlackmail (1929) New Scotland Yard, Victoria Embankment, London, closeup, object and signBlackmail (1929) signBlackmail (1929) signBlackmail (1929) signBlackmail (1929) signBlackmail (1929) signBlackmail (1929) British Museum, London and signBlackmail (1929) New Scotland Yard, Victoria Embankment, London, object and sign