A ref. 5975R, a chronograph made in celebration of Patek Philippe's 175th Anniversary. It features a unique case with stepped, angular lugs, vintage-leaning triple scale dial, and automatic calibre 28-520 with a column wheel and vertical clutch. In this pink gold configuration, it was made in a limited series of 400 examples. It is a decidedly historic chronograph with many signature touches, a forgotten and distinct celebration.