1mm. Whilst AP marketed the watch as “Additional-Thin,” enthusiasts continued to check with it as “Jumbo” offered its 39mm scenario. Other slight modifications integrated a change from a white day wheel to the black version around the blue and black dials as well as the addition of a double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/