1mm. When AP promoted the watch as “Further-Thin,” followers continued to confer with it as “Jumbo” given its 39mm scenario. Other slight changes involved a change from a white date wheel to some black Variation to the blue and black dials and also the addition of the double-deployant clasp for https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/