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The article at present, citing ONDB, gives the date as 27 February 1899. But a footnote mentions that Who's Who records his birth date as 7 March 1889.
The register also discloses that he was born at No 64, Potterrow, Edinburgh and his birth was registered on 27th March 1899 by his mother, Minna Cohen or Levy. His parents had married in Leeds on 16th March 1884 according to the register.