As the name indicates, the watch case is made of lightweight, non-tarnishing and non-allergenic titanium. Glass: Sapphire crystal. Movement: Swiss ETA. Strap: Black rubber. Date function. Water resistant 3 ATM/30 meters. Diameter: 35mm/1.38". Jacob Jensen was born in Copenhagen in 1926. He is recognized as one of the most creative designers of the 20th century. Over the past 40 years, Jacob Jensen has created hundreds of industrial products winning international acclaim with many examples of his work included in MoMA's Design Collection. Jacob Jensen Design continues today under the direction of his son Timothy Jacob Jensen.