1mm. While AP promoted the watch as “Excess-Thin,” admirers continued to check with it as “Jumbo” offered its 39mm case. Other slight changes provided a change from a white day wheel to the black version over 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/