1mm. Though AP promoted the watch as “Extra-Thin,” followers continued to make reference to it as “Jumbo” supplied its 39mm circumstance. Other slight improvements provided a switch from a white day wheel to some black Variation within the blue and black dials as well as addition of the double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/