1mm. When AP promoted the watch as “Further-Thin,” enthusiasts ongoing to check with it as “Jumbo” offered its 39mm case. Other slight alterations integrated a switch from a white date wheel into a black version to the blue and black dials as well as the addition of the double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/