NEW YORK, Jan 25 (Reuters) - U.S. copper futures extended a bounce from last week's slide to one-month lows Monday morning, but gains were held in check due to lingering worries about bank regulation in the United States and prospects for further Chinese monetary tightening measures. For detailed report on global copper markets, click on [MET/L] * Benchmark copper for March delivery HGH0 firmed 4.00 cents, or 1.2 percent, to $3.3870 per lb by 10:37 a.m. EST (1537 GMT) on the New York Mercantile Exchange's COMEX division. * Range from $3.3240 to $3.3975. * On Friday, key March contract slipped to $3.2670, its lowest level since Dec. 24. * COMEX estimated futures volume at 13,719 lots by 10 a.m. * Copper up in extended bounce from Friday test of key technical support near $3.30 per lb, with firmer tone in equities and weak dollar providing early support - traders. * Euro up against the dollar EUR= after an offer of five-year Greek sovereign bonds met strong demand, easing some concerns over the euro zone's credit problems. [USD/] * Copper gains buck economic recovery jolt from data showing sales of previously owned U.S. homes fell 16.7 percent in December -- the fastest pace on record. [ID:nN25214275] * Copper momentum slowed by investor concerns over President Obama's proposal to rein in bank sizes and excessive risk-taking. [ID:nN21658127] * Copper upside capped by Chinese credit-tightening fears in effort to prevent its economy from overheating. [ID:nECONCN] * China's economy finished 2009 with a flourish, with 10.7 percent year-on-year growth in fourth-quarter GDP. * London Metal Exchange (LME) copper warehouse stocks down 800 tonnes to 533,400 tonnes. Stock levels near their highest since late February and more than double the levels seen in middle of July 2009. <0#LME-STOCKS> * COMEX copper stocks rose 288 short tons to 102,003 short tons as of Friday. * Money managers added to their net long positions in COMEX copper futures by nearly 5,500 contracts in week ended Jan. 19 - data from U.S. Commodity Futures Trading Commission. [ID:nN22174820] * LME copper for three-month delivery MCU3 last traded at $7,460 a tonne, up $70 from Friday's close. (Reporting by Chris Kelly; Editing by Lisa Shumaker)

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