Rolex Cosmograph Daytona watch, polished round 18kt yellow gold case (40mm diameter, 11mm thickness) with screw-down Triplock winding crown and screw-down pushbuttons, protective crown guard, polished 18kt yellow gold tachymeter engraved bezel, 18kt yellow gold Oyster bracelet with Oysterlock clasp, black dial with luminous index hour markers, 44 jewel Caliber 4130 self-winding mechanical Oyster Perpetual chronograph movement, scratch-resistant sapphire crystal, water-resistant to 100 meters. The legendary Rolex Cosmograph Daytona wristwatch traces back at least to 1961, when Rolex began manufacturing the Rolex Cosmograph. Rolex was a sponsor of the 24 Hours of Daytona race at the time, and named its new chronograph watch after that famous race. It was a brilliant marketing ploy. Due to its limited production and increasing popularity, the stainless steel Rolex Cosmograph Daytona is considered a very rare and collectible watch to own. The Rolex Cosmograph Daytona is also one of the most expensive watches marketed enough to be readily recognised by non-enthusiasts, and is often worn for this reason. The Daytona comes in several models in steel, gold, or a combination of steel and gold. Within these metals, one can also choose from a variety of dial colors, leather strap or gold bracelet, and jeweled and non-jeweled versions.