Tissot Visodate Collection Gents Heritage Visodate Watch With A Grey Sterling Silver Mesh Style Strap, Silver Opalinon Coloured Dial & Date Window. Back in the 1950s, Tissot celebrated its centenary with a series of innovations ñ one of which was the integration of a date function to the automatic mechanism in a watch called Visodate. The Tissot Heritage Visodate translates nostalgia into contemporary timepieces dedicated to detail. A gently curved dial mirrors the domed sapphire glass, both geared to showcasing a clearly visible date. Historical Tissot logos on the dial, case back, crown and buckle are a bridge between the past and present. Sapphire Crystal Glass A sapphire crystal gives a watch the following properties: extremely high resistance to impact and superior screen and hand readability thanks to its transparency. Because it is the strongest material after diamonds, it is used in fine timepieces for its anti-scratch prowess. Sapphire crystals can take many forms and give the watch a variety of looks: flat, domed, concave or ground. Water Resistance All Tissot watch cases undergo several tests, including a water resistance check. Tissot tests the watch's ability to resist impacts and pressure, as well as the penetration of liquids, gas and dust by replicating the real-life conditions in which the watch may find itself.