1mm. Whilst AP marketed the watch as “Further-Thin,” followers continued to seek advice from it as “Jumbo” given its 39mm situation. Other slight variations involved a switch from a white day wheel to some black Variation over the blue and black dials and also the addition of a double-deployant clasp https://www.watchesworld.com/a-guide-to-10-of-the-best-dress-watches/