This watch is also known as:
5951 , 5951P , 5951P.001 .
Patek Philippe Grand Complications Perpetual Calendar Split Seconds Chronograph. Mechanical Manually Wound Movement. Caliber CHR 27-525 PS Q. 60-Minute Counter. Day, Month, Leap Year and Day/Night Display in Apertures. Date Subdial at 6 o'clock. Moon Phase. Seconds Subdial. Black Dial, Gold Applied Hour Markers. Strap: Alligator with Rectangular Scales, Hand-Stitched, Matt Black with Red Stitching. Prong Buckle. Interchangeable Full Back and Sapphire-Crystal Case Back. Water Resistant to 30 m. Platinum. Dimensions; 37.0 x 45.0 mm