1mm. When AP marketed the watch as “Excess-Thin,” enthusiasts continued to refer to it as “Jumbo” given its 39mm circumstance. Other slight modifications integrated a change from a white day wheel to a black Edition over the blue and black dials as well as addition of the double-deployant clasp on https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/