Cartier Tank Solo, maybe mine one day!  The 1st Tank wristwatch was created in 1917 and was inspired by a simple idea: four lines, with two parallel shafts made from gold or platinum, a sapphire cabochon atop the winding crown and a leather strap. With its infinitely refined and timeless design, this revolutionary square watch took shape and forever changed the world of watchmaking. Yet the story of the Tank has only just begun.