1mm. Although AP marketed the watch as “Extra-Thin,” supporters continued to refer to it as “Jumbo” provided its 39mm case. Other slight modifications bundled a switch from a white day wheel to some black Variation about the blue and black dials along with the addition of the double-deployant clasp for https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/