History of the Rolex Cosmograph Daytona
Rolex introduced the Cosmograph in 1963 as reference 6239, a chronograph for racing drivers with the tachymetric scale engraved on the bezel rather than printed on the dial, which kept the dial clear. It used a manually wound Valjoux 72 base, finished by Rolex, and soon took the name Daytona after the Florida circuit, where Rolex had long been associated with speed records. Screw-down pushers arrived in 1965 with reference 6240, and the Oyster references 6263 and 6265 carried the model into the late 1980s. In 1988 Rolex introduced the self-winding reference 16520 in a larger 40 mm case, with calibre 4030 based on the Zenith El Primero. In 2000 the 116520 moved to calibre 4130, Rolex's own automatic chronograph movement, with fewer parts and a longer power reserve. In 2016 the steel 116500LN gained a black Cerachrom bezel, and in 2023 the 126500LN introduced calibre 4131 and refined case proportions. That same year the platinum 126506 became the first Daytona with a sapphire display caseback. The Daytona is made in Oystersteel, Rolesor, 18KT gold and platinum, and is fitted with a Triplock crown.
Key references
| Ref. 6239 | 37 mm, stainless steel (also 18KT gold). Manual-winding Valjoux 72 base. Introduced 1963. The first Cosmograph, with pump pushers and a steel tachymeter bezel. |
|---|---|
| Ref. 6263 | 37 mm, stainless steel. Manual-winding Valjoux 727 base. Made from the early 1970s to 1988. Screw-down pushers and a black acrylic bezel insert. |
| Ref. 16520 | 40 mm, stainless steel. Automatic calibre 4030, based on the Zenith El Primero. Made from 1988 to 2000. The first self-winding Daytona. |
| Ref. 116520 | 40 mm, Oystersteel. Calibre 4130. Made from 2000 to 2016. The first Daytona with Rolex's own chronograph movement. |
| Ref. 116519 | 40 mm, 18KT white gold. Calibre 4130. Made in the 2000s and 2010s, usually on a leather strap. Offered with a range of dials, including black racing dials with red accents. |
| Ref. 116500LN | 40 mm, Oystersteel. Calibre 4130. Made from 2016 to 2023. Black Cerachrom bezel with white or black dial. |
| Ref. 126500LN | 40 mm, Oystersteel. Calibre 4131. Made from 2023. Slimmer bezel and lugs, and Rolex Côtes de Genève decoration on the movement. |
How to spot a fake
- The reference number is engraved between the lugs at 12 o'clock; older pieces have the serial at 6 o'clock, later ones on the rehaut within the repeating ROLEX inscription.
- All three chronograph functions should work smoothly: start, stop and a clean reset to zero. The running seconds sit at 6 o'clock on calibre 4130 and 4131 watches, at 9 o'clock on 6239, 6263 and 16520.
- On the 16520 the subdials are arranged with the small seconds at 9 o'clock, as calibre 4030 dictated. A 16520 dial laid out like a 116520 is not original.
- The tachymeter bezel numbers should be cleanly engraved or, on Cerachrom, crisply filled and level.
- The caseback is plain and solid on every reference except the platinum 126506, which has a sapphire display back.
- Open the case: 4030 in a 16520, 4130 in a 116520 or 116500LN, 4131 in a 126500LN.
- Screw-down pushers and the Triplock crown should screw in fully with no grinding; the crown shows three dots beneath the coronet.
- Bracelet clasps carry a code and bracelet reference; papers or warranty card must match the case serial.
How we check a sourced piece
Every Daytona we source is opened by a watchmaker, who confirms the calibre matches the reference, tests the chronograph start, stop and reset, checks the case serial against the period of production and records timing on a timegrapher. We review any service history and paperwork and send you detailed photographs and video before you commit to buy. Mozeris Fine Antiques is an independent dealer and is not affiliated with Rolex.
