* Nikkei down 3.1 pct, could see lowest close in 6 wks
* Fear about European banks fanned by huge RBS loss
* Trade thin before Obama inauguration, Wall St response
* Exporters down on yen, trading houses fall on oil (Adds stocks, details)
By Elaine Lies
TOKYO, Jan 20 (Reuters) - The Nikkei stock average fell 3.1 percent on Tuesday as Mizuho Financial Group <8411.T> and other banks slid on worry about European bank stability, while a stronger yen sparked selling of exporters amid thin trade. With Wall Street closed on Monday for a holiday, Japanese investors were taking their cue from Europe, where British shares fell as the Royal Bank of Scotland <RBS.L> nosedived after posting the biggest loss in UK corporate history, leading the banking sector down. [
]Kyocera Corp <6971.T> and other high-tech shares slipped on worry about slumping demand amid the global recession, while trading houses slid after oil fell over $2 overnight.
But Kirin Holdings Co <2503.T>, Japan's second-largest brewery, bucked the trend to edge 0.7 percent higher on plans to buy a 43 percent stake in the beer unit of the Philippine conglomerate San Miguel Corp <SMC.PS>, a deal that will likely cost it at least $1.3 billion. [
]"The fact that RBS has suffered such a huge loss has revived worries about financial instability in Europe, while a slightly stronger yen is pressuring exporters," said Noritsugu Hirakawa, a strategist at Okasan Securities.
"There are a lot of hopes for (U.S. President-elect Barack) Obama, but investors are cautious at this point because they want to see how Wall Street responds to his inaugural address."
The market is aware of several variations for Obama's economic stimulus proposals but the key thing at this point is when the plans will be enacted, with investors hoping to glean some hints on this from his speech, Hirakawa added.
The benchmark Nikkei <
> shed 257.83 points to 7,999.02. If it finishes below 8,000, it would be the first such close in more than six weeks.The broader Topix <
> lost 2.4 percent to 798.06.TUG-OF-WAR
Attention was currency moves as the yen advanced against the dollar. The U.S. currency was down 0.3 percent at 90.35 yen [
]"There are still strong hopes for economic policies from Obama, and the tug-of-war between these hopes and the reality of the poor global economy goes on," said Hiroichi Nishi, general manager of the equity division at Nikko Cordial Securities. Bank shares followed global peers lower after Royal Bank of Scotland said it would report a 2008 loss of up to 28 billion pounds, the biggest loss in British corporate history [
]Mizuho Financial Group shed 5.8 percent to 229 yen and Sumitomo Mitsui Financial Group <8316.T> lost 4.1 percent to 3,520 yen. Mitsubishi UFJ Financial Group <8306.T> fell 2.9 percent to 502 yen.
Trading houses such as Mitsubishi Corp <8058.T> took a hit after oil prices fell nearly $2 in electronic trading as supply concerns eased, with Russia and Ukraine signing a gas deal and Israel and Hamas implementing a ceasefire in Gaza. [
]New York crude for February delivery <CLc1> was trading at around $34.70 a barrel, close to levels late on Monday.
Mitsubishi, Japan's largest trading house, lost 4 percent to 1,239 yen and fellow trader Mitsui & Co <8031.T> fell 3.2 percent to 893 yen. Itochu Corp <8001.T> fell 6.1 percent to 432 yen.
Shares of Toshiba Corp <6502.T> fell 5.1 percent to 390 yen after Mitsubishi UFJ Securities cut its rating on the electronics conglomerate to "4" from "3", warning of widening losses due to its struggling chip operations and weak economic conditions.
Other high-tech shares slid as well, with Kyocera down 2.1 percent to 6,120 yen, Advantest Corp <6857.T> losing 7.3 percent to 1,209 yen and TDK Corp <6762.T> shedding 4 percent to 3,340 yen.
Among big exporters, Canon Inc <7751.T> lost 1.6 percent to 2,760 yen, Sony Corp <6758.T> lost 4.3 percent to 1,990 yen, and Toyota Motor <7203.T> fell 2.0 percent to 2,970 yen. Shares of Showa Denko <4004.T> jumped 5.5 percent to 134 yen after a newspaper reported it and Furukawa Electric Co Ltd <5801.T>, Japan's top aluminium products maker, were in the final stage of talks on merging their aluminium operations. [
]Furukawa Electric fell 7.1 percent to 353 yen.
Trade was light on the Tokyo exchange's first section, with 813 million shares changing hands, compared with last week's morning average of 899 million.
Declining stocks outpaced advancing ones by nearly 6 to 1. (Reporting by Elaine Lies; Editing by Edwina Gibbs)