1mm. Although AP promoted the watch as “Excess-Thin,” enthusiasts ongoing to check with it as “Jumbo” given its 39mm case. Other slight adjustments included a swap from a white day wheel to some black Edition on the blue and black dials as well as addition of a double-deployant clasp on https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/