1mm. When AP marketed the watch as “Extra-Thin,” lovers continued to check with it as “Jumbo” supplied its 39mm case. Other slight improvements bundled a change from a white day wheel to a black Variation within the blue and black dials as well as addition of the double-deployant clasp into https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/