* Won hits 6-year peak, but intervention nerves kick in     * KOSPI tracks Wall Street higher, hits 3-week high     * Bond futures jump on bets for policy rate cut      SEOUL, July 2 (Reuters) - The South Korean won  
  KRW=
   edged up to hit a six-year high on Wednesday morning as expansive manufacturing data from the U.S. and China fuelled optimism about global economic conditions, sharpening risk appetite.      But gains were trimmed as local authorities expressed concern over the won's one-sided appreciation soon after the currency hit an intraday high of 1,009.3 at 0149 GMT, the strongest level since July 31, 2008.     A joint statement from the Ministry of Strategy and Finance and the Bank of Korea said authorities are closely observing institutions and offshore traders' trading patterns for unusual movements. 
  ID:nL4N0PD0I3
       "By issuing a joint statement, authorities have exhibited some degree of determination (to curb the pace of appreciation). It appears likely the authorities will follow up with dollar-buying intervention," one currency dealer said.         The local currency  
  KRW=KFTC
   was quoted at 1,009.9 versus the dollar as of 0247 GMT, up 0.2 percent from Tuesday's onshore close at 1,011.7.     In the local stock market, the benchmark index KOSPI  
  .KS11
   rose 0.8 percent to 2,014.73 points as of 0247 GMT after rising as high as 2,016.36, the strongest intraday level since June 11.     "Foreign capital inflows are lifting the market today, reflecting that the market is highly dependent on supply and demand conditions and liquidity," said SK Securities market analyst Ko Seung-hee. "The focus in the second half should be set on any changes regarding liquidity conditions."      Foreign investors purchased a net 142 billion won ($140.62 million) worth of KOSPI shares near mid-session, appearing to extend the net buying streak to a fifth session.     Samsung Electronics Co Ltd  
  005930.KS
  , the world's largest mobile handset maker, rose 1.5 percent while chipmaker SK Hynix Inc  
  000660.KS
   added 3.6 percent. Shipbuilder Hyundai Heavy Industries Co Ltd  
  009540.KS
   advanced 3.4 percent.     Lead September futures on three-year treasury bonds  
  KTBc1
   jumped 0.25 points to 106.72 after a batch of weak data bolstered bets the Bank of Korea will cut interest rates to support the economy.     South Korean exports, inflation and manufacturing activity for June all showed Asia's fourth-largest economy was losing momentum. 
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                          0247 GMT    Prev close  Dollar/won            1,009.9       1,011.7  Yen/won            9.9390/341        9.9503  *KTB futures           106.72        106.47  KOSPI                2,014.73      1,999.00  * Front-month futures on three-year treasury bonds ($1 = 1009.8000 South Korean Won)   (Reporting by Jungmin Jang; Additional reporting by KyoungHo Lee; Editing by Eric Meijer)  ((jungmin.jang@thomsonreuters.com)(822 3704 5643)(Reuters Messaging: jungmin.jang.thomsonreuters.com@reuters.net))  Keywords: MARKETS SOUTHKOREA/