These are three superb references, the 5070 manual wind chronograph, the 5327 perpetual calendar, and then the reference that combines both complications into one spectacular piece, the 5970 perpetual calendar chronograph. Right now on the secondary, values of the 5970 ($120k) are almost exactly what one would pay in buying separately the 5070 and 5327 combined (about $60k each). Given this, it begs the question: For these pieces and complications, would you rather own one piece that combines them all (5970) or two pieces to keep these complications separate (5070 and 5327)?