There are other features to look for as well-such as the uncrossed T on Breguet. I am no expert (but there are many on this forum), and the best resource I have found is Don Indiano-I'm not sure if the link works but easily found through a search engine. www.donindiano.net
I also tried one on recently at the boutique-I would be very happy to own one. I also tried the titanium version and was astonished how lightweight it felt. The dial and heft on the white gold are definitely good points.