TOKYO, Oct 7 (Reuters) - Tokyo's Nikkei average fell to a new 19-year intraday low on Monday, led by drops in banks and other blue chips such as Sony Corp, with sentiment beaten by another tumble on Wall Street. The Nikkei was down 180.81 points or 2.00 percent at 8,846.74 as of 0011 GMT, its lowest intraday since 1983. The TOPIX index was down 1.85 percent at 875.10. Major bank issues extended last week's heavy losses, with Mizuho Holdings falling 4.72 percent to 203,000 yen and UFJ Holdings sliding 6.88 percent to 203,000, adding to a 32 percent loss last...