Odd Sizes

WatchTime - - READERS’ FORUM - David R. Hughes via email

What is the ex­pla­na­tion for the strange di­men­sions of watch cases, as il­lus­trated in your June 2017 ar­ti­cle, “El­e­gant So­lu­tions”? e Fred­erique Con­stant Man­u­fac­ture Clas­sic mea­sured 41.89 mm, the Longines Mas­ter Col­lec­tion 38.42 mm, and the Mont­blanc Star Clas­sique Date Au­to­matic 38.97 mm. I can see man­u­fac­tur­ing cases in whole mm (e.g., 40.00), or maybe even half mm (e.g., 40.50). But how do you end up with 41.89 mm?

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