I have the 701, 702 and 703 knives in my collection but bought another 703 because it came in a very nice wooden box, and was in mint condition. In comparing it to my other 703 I noticed the blade is shorter. In measurement, it is 3/8 ths of an inch shorter. The longer knife has an earlier serial number than the shorter one. The sorter one shows no signs of being reground. Does anyone know why this might be?