1mm. While AP marketed the watch as “Additional-Thin,” admirers continued to make reference to it as “Jumbo” supplied its 39mm scenario. Other slight improvements involved a swap from a white date wheel to a black Variation over the blue and black dials and also the addition of the double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/