Bond investors are looking to Japan for clues after the U.S. credit downgrade and two years of zero interest rates. William O'Donnell, chief Treasurys strategist at RBS Securities sees similiarities with what happened in Japan- short term rates near zero and long term rates headed down. strategists see the U.S. 10 year Treasury note dropping to less than 2%, from 2.23% today. Japan's 10 year Treasury note yields 1.05%. O'Donnell's forecast is for 10 year rates to be at 1.70% by mid-2012.