I own a 673, which I purchased new. I love the watch, though my wrist is only 6.75" and I most wanted a 587. A new 587 was not available at the time, but the 673 was. The two are really quite similar, though there are slight variations to the case and the crown guard, of course. I like the simplicity of the 587, especially with the trimmer pencil hands. I do remember one person saying, however, that he slightly preferred the fit and feel on his smaller wrist of the 673 to the 587, which was surprising, given the extra bulk of the crown guard. They're both absolutely beautiful watches and their dials and hands are simply stunning. You can't go wrong with either. At this point, I'd buy the best one you can find and not worry too much which it is.