This memorial fountain was unveiled in 1932.
From Wiki this info:
It is named after J. F. Archibald, owner and editor of The Bulletin magazine, who bequeathed funds to have it built. Archibald specified that it must be designed by a French artist, both because of his great love of French culture and to commemorate the association of Australia and France in World War I. He wished Sydney to aspire to Parisian civic design and ornamentation. The artist chosen was François-Léon Sicard.