HONG KONG, Sept 18 (Reuters) - Hong Kong shares are set to start 0.59 percent lower on Friday, a pull back from a 13-month high in the previous section, tracking softer overseas markets on concern that gains are overextended, and despite accelerating optimism for an economy recovery.
The benchmark Hang Seng Index will open down 127.54 points at 21,640.97.
The China Enterprises Index, which represents top locally listed mainland Chinese stocks, was down 0.34 percent at 12,624.84, while the Shanghai Composite Index also edged down 0.49 after a firmer opening. (Reporting by Donny Kwok; Editing by Chris Lewis)