Rolex Oyster Submariner Date Yellow Gold “Purple Dial” Precious Rolex Oyster Perpetual Submariner Date in Yellow Gold blue / lilac dial “Purple dial” very difficult to find, very exclusive piece. Reference 16618. 40 mm yellow gold case, sapphire crystal, blue bezel, yellow gold oyster bracelet with folding clasp (without gaps). Rolex COSC automatic movement. Year 1991 Series N. With Rolex box. With one year warranty.