1mm. When AP marketed the watch as “More-Thin,” admirers continued to seek advice from it as “Jumbo” presented its 39mm case. Other slight alterations integrated a change from a white day wheel to the black version on 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/