TREASURY SAYS ONLY REAGAN, BAKER SPEAK ON DLR The U.S. Treasury repeated a White House statement that only President Reagan and Treasury Secretary James Baker are authorized to speak on the dollar. A Department spokesman was commenting on remarks by Commerce Department Under-Secretary Robert Ortner that the yen was undervalued 10 or 15 pct against the dollar but European currencies were fairly priced against the U.S. currency. "As Larry Speakes said on January 14 this year, only two people in this administration are authorized to speak on the dollar and that is the president and the secretary of the treasury," the spokesman told Reuters.