Now, I just want to correct a previous misconception that I was under and has been repeated often (including by me) throughout the thread: Many respected members hae said that the SD 16600 did not have an LEC on the crystal. This is FALSE. My WM (who worked for Rolex) corrected my misconception. All SD 16600 made in 2003 forward [correction: most] have an LEC on the crystal. The LEC is usually located at ninety degrees from the cyclops on a rolex crystal. On watches that didn't have a cyclops, there was no process in place early on to line up the LEC perfectly, so on many Daytonas, ND subs and SD's made before 2005, the LEC could be found anywhere--not necessarily at 6. Later on, Rolex tightened their standards so that even on non-cyclops crystals, the LEC appears at 6. Here's a picture of a gen SD with LEC:
The fact that the BPSD does not have an LEC means little to me though because a real LEC should not be visible anyway. The only visible LEC's are the crappy LEC's on older reps. I'll skip the LEC and enjoy the amazing quality, gen spec crystal that comes with the BPSD!