The Friday file: The world’s thinnest watch is, for the 9th time, a Bulgari, this time the Bulgari Octo Finissimo Ultra, at 1.7 millimeters (0.0669 inches). This breaks the previous 7/22 record of 1.75mm set by the RM UP-01 Ferrari, which broke the previous record of 1.8mm set by the Octo Finissimo Ultra in 3/22. Only 20 of these watches will be made to help justify the $529,000 price.