1990 Rolex Oyster Perpetual Day-Date "Sapphire String" 18238An extremely well preserved 1990 Rolex Oyster Perpetual Day Date aka President in 18k yellow gold reference 18238 double quick set with a top condition and very rare "Sapphire String" dial featuring approximately 50 round brilliant cut diamonds and 10 round brilliant cut sapphire hour markers paired with the original no lume hands. The watch is in excellent condition showing light signs of age and or scratches. All watches are checked by our