1mm. Even though AP marketed the watch as “Additional-Thin,” lovers ongoing to confer with it as “Jumbo” given its 39mm case. Other slight alterations integrated a switch from a white day wheel to the black Edition about the blue and black dials as well as addition of the double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/