1mm. Though AP marketed the watch as “Excess-Thin,” enthusiasts ongoing to refer to it as “Jumbo” provided its 39mm scenario. Other slight modifications involved a switch from a white date wheel into a black Model around the blue and black dials and also the addition of a double-deployant clasp on https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/