Montblanc's first sports dive watch, the Montblanc 1858 Iced Sea Automatic Date, features a dial with a "glacier" pattern that gives the impression of looking into the depths of a glacier. This blue dial with "glacier" pattern is inspired by the Mer de Glace (Sea of Ice), the main glacier of the Mont Blanc Massif. Its texture was achieved using an almost forgotten ancestral technique called gratté-boisé. The timepiece features a unidirectional two-tone ceramic bezel, an engraved case back, and an interchangeable blue rubber strap with fine adjustments. The timepiece complies with the ISO 6425 standard for diving watches and is water resistant to 300 meters.
Movement type Self-winding Caliber MB 24.17 Number of jewels 26 Jewels Flat spiral Hour markers, Minute, Date window, Seconds in center Complications Disc with date Case material Stainless steel Dial Blue dial with "glacier" motif with rhodium-finished luminescent Arabic numerals Bezel Unidirectional rotating bezel Shape crystal Domed crystal Description Domed sapphire crystal with anti-reflective coating Crystal type Sapphire Crown Screw-down and fluted in fine steel with raised Montblanc emblem Lug width 20 mm Bezel colour Blue Water resistance 30 bar (300 m) bar Case back material Fine steel case with two-tone unidirectional ceramic bezel Bracelet colour Blue Case diameter 41 mm Bezel material Steel - Ceramic