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On the sign:
HENRY TONKS FRCS 1862-1937 PAINTER AND SLADE PROFESSOR IN THE UNIVERSITY OF LONDON LIVED HERE FROM 1910 FOR THE REMAINDER OF HIS LIFE
The sign is on the wall of the house where the surgeon (FRCS - Fellowship of the Royal Colleges of Surgeons) Henry Tonks (1862-1937) lived, who was better known as a painter and was even a Slade Professor (the title of Professor of Art at the Universities of Oxford, Cambridge and University College London where he taught)