Plaque reads:

MUNICIPALITY OF WOOLLAHRA COOPER PARK
TO COMMEMORATE THE CONSTRUCTION OF THIS WALL AND OTHER IMPROVEMENT WORKS FOR THE PUBLIC WELFARE IN THIS PARK CARRIED OUT BY THE UNEMPLOYED RELIEF WORKERS IN THE YEAR 1936 DURING THE MAYORALTY OF ALDERMAN K.D. MANION.
J.C. LOUGH, TOWN CLERK

Monuments and Memorials in Woollahra, original survey 1987, supplemented 1993/1994, compiled by the Woollahra History and Heritage Society.