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