1mm. Though AP marketed the watch as “More-Thin,” followers continued to check with it as “Jumbo” offered its 39mm scenario. Other slight alterations provided a switch from a white date wheel into a black Variation on 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/