16520, Daytona, Singer Prototype Dial, Steel 881101/01 3941 is the earliest execution

3941 is the earliest execution of the sapphire back ref

Well-preserved here

The movement is split between a lower half

The pink gold case is 34mm

3312 Yacht Club II Jumbo

16520, Daytona, Singer Prototype Dial, Steel 881101/01 3941 is the earliest executionA ref. 16520 with Singer prototype dial, a rare variant of the first automatic Daytona reference. Rolex made over 200 modifications to the Zenith El Primero base to create its calibre 4030. Its dial features a unique combination of arabic numerals and Inverted Six lower subregister, a pre production proof of concept from Rolexs dial manufacturer through the late 1990s when higher emphasis was placed on in house manufacturing. The layout never entered