Le Mans Daytona 'Double Swiss Underline', Reference 6239 | A stainless steel chronograph wristwatch with double Swiss underline dial and bracelet | Circa 1963 | 勞力士 | Le Mans Daytona 'Double Swiss
A History of the Rolex Daytona Watch From 1963 to Present
Rolex Daytona 6263 - Rolex Passion Market
A History of the Rolex Daytona Watch From 1963 to Present
Others born in 1963 like the Daytona? - Rolex Forums - Rolex Watch Forum
Rolex Daytona ref.6238 "service dial/bezel" from 1963 | Relojes Vintage Mexico Official Webpage – rvmusa
Historical Perspectives: The Very First Rolex Daytona, Explained (Or, What Is A Double-Swiss Underline Daytona?) - Hodinkee