1mm. When AP promoted the watch as “Further-Thin,” enthusiasts ongoing to make reference to it as “Jumbo” provided its 39mm circumstance. Other slight variations provided a change from a white day wheel to a black Variation within the blue and black dials as well as addition of a double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/