WALKMAN: How to find the serial number?

1. On the back of your WALKMAN 
2. On your WALKMAN product box 
3. On your WALKMAN invoice or receipt 

On the back of your WALKMAN
The serial number of a product is usually a 7 digit number printed on a label on its back.

On your WALKMAN product box
Should you still retain the original box. The serial number can be found on the bar code affixed to the box.
 

On your WALKMAN invoice or receipt
Your product invoice or receipt may list your serial number.