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Rolex Daytona El Primero .Zenith Movement . Inverted 6. Box and Papers.
Rolex Daytona Cosmograph "El Primero" 16520 from 1991 - Longitudi
Rolex Encyclopedia » The Rolex Daytona and the Zenith El Primero caliber 400
S/S Rolex Daytona Ref 16520 Zenith A Series Automatic Cal. 4030 based - Francis Jewellers
Rolex Daytona Cosmograph "El Primero" 16520 from 1991 - Longitudi
ROLEX - Daytona "El Primero" ref 16520 cronografo automatico, cassa in acciaio con quadrante nero, tre contatori e lunetta tachimetrica - Auction Wrist and Pocket Watches - Cambi Casa d'Aste