Two months ago on October 12th, 2014, Patek Philippe presented 25 timepieces to celebrate its 175th anniversary as reported here. One of these 25 commemorative timepieces is the Patek Philippe ref. 5975, a Multi-Scale Chronograph available in three precious metal variations and with a dial fitted with a tachymeter, telemeter and a pulsometer. With these chronographs Patek Philippe has returned to the source of the chronograph by creating a multiple-scale instrument whose face combines technical panache with finesse. Patek Philippe has always accorded a prominent role to the chronograph. Between 2005 and 2012, reaffirmed its know-how and supremacy by developing a range of eight chronograph movements built entirely in its own workshops. They extend from the classic manually wound chronograph with column wheel and horizontal clutch to the self-winding chronograph with vertical disc clutch and to the highly complex split-seconds chronograph, with or without perpetual calendar.