(IDEX Online) - Swiss watchmaker Richard Mille has launched the world's thinnest mechanical watch.It has a profile of just 1.80mm, shaving 0.05mm - about the thickness of a human hair - off the previous record holder, Bulgari's Octo Finissimo Ultra.The Richard Mille RM UP-01 Ferrari Ultra-Thin is the culmination of countless prototypes and more than 6,000 hours of R&D and laboratory testing, in collaboration with fellow watchmakers Audemars Piguet Le Locle and car makers Ferrari.They will make a limited edition of 150 watches, crafted from super-strong titanium, with a price tag of $1.73m."RM UP-01 Ferrari constitutes a triumph of technical prowess and exemplifies a new approach to watch mechanics in which technicity more than ever dictates aesthetics," the company said.