I just planned to indicate the Nomos Tangente Ref. 101 is water-proof to 30m, not 100m. It doesn’t detract in the slightest degree from it however. It’s a beautiful timepiece! Robert Mühle opened the doors of his namesake Glashütte-centered model in 1869, although it specialized in creating exact measuring instruments https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/