1mm. Even though AP promoted the watch as “Additional-Thin,” enthusiasts ongoing to refer to it as “Jumbo” given its 39mm case. Other slight alterations included a switch from a white date wheel into a black Variation around the blue and black dials plus the addition of a double-deployant clasp for https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/