Rolex Daytona 6239 Stainless Steel 1960s - Gisbert A. Joseph Watches
A Beginner's Guide to the early Rolex Daytona (1963-88) – Goldammer Vintage Watches
Tracking the Rolex Daytona: A 53-Year History | WatchTime - USA's No.1 Watch Magazine
Vintage Watches: A 1966 Rolex Daytona 'Small Daytona,' A 1960s Heuer Autavia, And A 1960s Universal Genève Polerouter Date In 18k Pink Gold - Hodinkee
Cool Rolex of the Day #1090: 6238 "Pre-Daytona" Chronograph, the first Rolex chronograph with contrasting subdials, steel, 36mm. Circa 1960's : r/rolex