Gold eased from a 4-1/2 month high on Friday but was still poised for its biggest weekly rise in more than two months as investor expectations of imminent bond buying by the US Federal Reserve cooled slightly. Spot gold eased 0.3 percent to $1,664.81 an ounce by 0618 GMT, on course for a 3.1-percent climb from a week earlier. It hit a 4-1/2-month high of $1,674.80 on Thursday. The US gold futures contract for December delivery fell 0.3 percent to $1,667.60.