hi, I have seen the change in caliber that patek has done recently, i am interested in knowing the advantage and disadvantage of each caliber. I understand that tha caliber 315 has been in thr pp 5146 sinse 1996. Has there been any difference in the 315 in all those years? I have the 315 and i have not had any problems. I wonder if the 324 is a much better caliber. like your opinions thanks jorge