This is a Rolex Daytona reference 6263 with Sigma dial. The dial does not have the Daytona writing and carries a clean look.
This timepiece has a Valjoux based 727 handwound movement which is just as reliable as a Rolex movement.
This is a stunning and gorgeous example. The Sigma sign unterneath the 6 o’clock signifies that the indexes are made of white gold and therefore cannot corrode.
The dial is in excellent condition, and really nice example of a nearly 40 year old Rolex.