The Rolex Daytona was the first stainless steel model to sport the caliber 4130, the first automatic chronograph movement developed and produced entirely in-house.  Previously, the collection relied on an outsourced movement. By bringing production of the Daytona movement in-house, Rolex could ensure even greater precision and a longer power reserve.  Furthermore, it incorporated the Rolex Parachrom hairspring for better anti-magnetism and shock resistance.  This model is widely sought-after for its steel-on-steel design set and its place in Rolex’s history.  It features a steel bezel (the current generation is equipped with ceramic), a classy black dial decorated with Super-LumiNova, silver-trimmed sub-dials, and a sleek Oyster bracelet with three-piece links.