This is a U series Daytona 16520
Case no. 16520/U610139
The white dial has changed from white to Ivory.
U series is the most desired batch and with the ivory dial.
lvory dial Daytona has appeared in major auction house auction couple of times over the so many years.
A watch dial can change color due to the carelessness of owner forgetting to tighten the winding crown or some rubber parts have worn out and moisture n heat enter into the case.
Some batches of Rolex watches change from white to ivory due to defective white paint used in the production.
Price : POA