Swiss Military day/date TANK NERO, Ronda cal. 517 Swiss Made quartz mvt., black/orange dial, black PVD plated stainless steel case & mesh bracelet (length 175mm, width 22mm, classic Milanese push buckle), screw-down crown, sapphire crystal. Case: diameter 44mm, thickness 12mm, 20atm water resistant. Weight: 148 gr. HS-Code: 9102.1100.116. Initiated by Winston Churchill himself the armoured car or tank was introduced by the British Army during the Great War, the First World War. Initially developed to overcome the stalemate in the trenches in Europe the tank has since become an invaluable and strategically decisive part of any armed force. The name „tank“ goes back the British Army’s attempt to hide the purpose of these vehicles – officially they were meant to be but mere water carrying vessels, hence „tanks“.model TANK – water resistant to 200 meters – is as rugged as its namesakes, the Milanese bracelet resembles the tracks while the heavy structure of the unidirectional bezel was shaped after a turret. The pattern of the bezel is repeated on the two-tone dial and the highly accurate quartz movement displays both day and date.