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In 1963 Rolex debuted in the motor racing competition with the Cosmograph Daytona line with the Ref. 6239. The early models and later production in the next 25 years since its launch, were fitted with manual-winding movements from external manufacturers.
The Valjoux calibre 72 chronograph movement customized by Rolex got the name calibre 72B, later calibre 722, before the upgraded calibre 727 took its place around 1970. Towards mid to late 80’s though, there was a clear trend towards self-winding watches. The thing was that creating a self-winding chronograph movement from scratch is no easy feat. Rolex needed a solution and it came in the form of the Zenith "El Primero" calibre 400, considered the best self-winding chronograph movement available on the market, becoming the clear choice for Rolex who only partnered with the best.
However, Rolex didn’t went through a direct transplant of the "El Primero" calibre into the Daytona and called it a day. Instead, extensive modifications were undertaken to align the new movement with Rolex’s requirements. This evolved movement went by the name calibre 4030. It became the forerunner to the first self-winding chronograph movement produced in-house by Rolex: the mighty calibre 4130 that still powers today’s modern ceramic Daytona models.
Alongside the self-winding movement, Rolex featured several aesthetic updates on the Daytona "Zenith". Most significant was the increase in case size. Whilst previous models had the smaller size of 37mm, the new reference 16520 was a more masculine and sturdy in 40mm, bringing the Daytona in-line with the other professional watches in the Rolex line-up such as the Submariner and the GMT-Master.
The bracelets have had their folding buckle and their end links evolve over time as well. Last series of the bracelet (1999/2000) have polished center links and solid end links (SEL) and a "flip-lock" clasp.
The Oyster case is equipped with screwed pushers, completely waterproofed.
Combining highly resistant materials as steel and yellow gold ("Yellow Rolesor"), this spectacular two-tone timepiece is the perfect companion for any sports or sophisticated occasion. The contrast of its slate dial and yellow gold markers are a complete delight to the eyes. Being the most sought after model among Rolex enthusiasts and collectors, this Rolex Cosmograph Daytona 116523 in Steel and Yellow Gold Slate Dial dazzles with an aggressive and sporty air but also ultra elegant, suitable for those willing to catch everyone's attention. Only true collectors know that this unique timepiece is one that cannot be missed in their personal collection.