Rolex Cosmograph Daytona (manual-wind, pre-Zenith) vs Rolex Cosmograph Daytona (Zenith-era)

Side-by-side at a glance. Click a watch above to open the full reference page.

	Rolex 6263	Rolex 16520
Model	Cosmograph Daytona (manual-wind, pre-Zenith)	Cosmograph Daytona (Zenith-era)
Caliber	Valjoux Cal. 727 -- manual-wind column-wheel chronograph, 18,000bph, 45h PR, 17j; lateral clutch; used in Rolex Daytona 6263 and 6265	Rolex Cal. 4030 -- base Zenith El Primero, modified to 28,800bph (down from 36,000bph), 50h PR, 31j; column-wheel; Rolex replaced El Primero escapement
Case size	37mm	40mm
Lug-to-lug	44mm	47mm
Years produced	1971–1988	1988–2000
Brand tier	luxury	luxury
Era	vintage	vintage
Movement tier	Unclassified movement	In-house manufacture
Market median (excellent / full-set)	n/a	n/a
Typical range	n/a	n/a
Confidence	low	low
Categories	chronograph, sport	chronograph, sport
Editorial	yes	yes
Collector note	most sought: The manual-wind pre-Zenith Daytona; Paul Newman exotic-dial examples within this reference number are among the most valuable wristwatches in any auction.	landmark: The first Daytona with an automatic movement; patina-dialed examples from early production are known as "Zenith Daytona" references by serious collectors.
Named dial variants	3 variants	2 variants