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On the sign:
Coat of arms of Harvard University HARVARD COLLEGE CLASS OF 1940
LT. COMMANDER , U.S. NAVAL RESERVE
ICI LE 15 FÉVRIER 1950 ROBERT S. WHITE DE CAMBRIDGE, MASS, USA.
ETUDIANT DE LFCOLE NATIONALE DES LANGUES ORIENTALES VIVANTES
AGE DE 31 ANS (1918-1950)
A GENEREUSEMENT FAIT LE SACRIFICE DE SA VIE EN ESSAYANT DE SAUVER UNE FEMME EN PERIL DANS LE FLEUVE
The sign is located where the American student from Harvard University jumped to save Raymonde Stibirtine who was crying for help from the waters of the Seine (apparently she was pushed into the river due to a romantic quarrel). Robert S. White drowned in the attempt of success together with the drowning.