Some of the more noticable differences with the YM are usually the date mag (which is 2.0x on the genuine), dial color, dial font color, seconds hand color, bezel font/spacing, crown guard shape, and of course, weight (below are some pics to illustrate). cpt's 16622 looks pretty damn good; many of the flaws that were typically found on reps of past appear to have been addressed for the most part (but a few still exist, which is to be expected in reps).
All in all, a nice looking watch, and one would indeed have to have this one side by side with a genuine to point out differences.