1mm. Though AP marketed the watch as “Excess-Thin,” lovers continued to confer with it as “Jumbo” specified its 39mm case. Other slight variations integrated a change from a white day wheel to some black version to 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/