About the reference number, model number, and serial number 

※The model number and serial number are inscribed on the case back of the watch.

Example 1: Only a number represented as a fraction appears, and the six-digit serial number does not appear.
⇒ Enter the numerator part of the fraction.
　　For example, enter the numbers in the numerator of No.000/000.
Example 2: Both the six-digit serial number and a number represented as a fraction appear.
⇒ Enter the six-digit serial number.