Rolex Datejust ref. 6305 Ovettone "Black depth dial"Not all Datejusts are born equal, with some being significantly rarer than others, such as this beautiful reference 6305 with a number of special features, including red DATEJUST, roulette date wheel, early fluted bezel and the cherry on the cake, a depth rating in black. These early Rolex big bubbleback Datejust watches are known by their Italian nickname Ovettone (big egg) due to the exceptional depth of case. This was necessary due to the auto wind