Reference Number WT1110 (often WT1110 - HQ424) Movement Swiss Quartz (Battery operated) Case Diameter 40mm (excluding crown) Case Material Brushed Stainless Steel Crystal Scratch-resistant Sapphire Crystal Water Resistance 200 Meters (20 ATM / 660 Feet) Dial Color Black Heritage: The Link series (originally known as the S/el or Sports/Elegance line) was famously worn by Formula 1 legend AYRTON SENNA. The WT1110 represents the third generation of this design. Bezel: Unidirectional rotating bezel with a 60-minute diving scale. Bracelet: Iconic Link-style "double S" links in brushed stainless steel with a double-locking deployment clasp. Crown: Screw-down crown to ensure maximum water resistance. Lume: Highly visible Super-LumiNova on hands and hour markers. Calendar: Date window located at the 3 o'clock position. Case Back: Solid screw-down case back with the TAG Heuer logo and model engravings. As chief watch, we have been buying and selling watches 2010. all our watches are thoroughly serviced before being offered for sale.