Japanese manufacturing activity in October expanded at the fastest pace in a year as new domestic and export orders increased, a private business survey showed on Monday. The Markit/Nikkei Japan Final Manufacturing Purchasing Managers Index (PMI) rose to a seasonally adjusted 52.4 in October, slightly less than a preliminary reading of 52.5 but a solid improvement from the final reading of 51.0 in September. The PMI for new export orders was 52.2 in October, just above a preliminary 52.1 and showing a return to growth from 48.0 in the previous month.