1mm. Though AP promoted the watch as “Further-Thin,” admirers ongoing to seek advice from it as “Jumbo” given its 39mm circumstance. Other slight modifications included a switch from a white day wheel to a black Edition over the blue and black dials as well as addition of a double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/