You never really know, usually engraving lowers the value but this isn't necessarily personalized so maybe not. This iPod isn't terribly special though, Apple does custom engravings for corporate giveaways all the time. Maybe you'll come across someone who collects Seat cars and would pay a premium to have this as part of their collection but otherwise I don't think any extra value is added, especially considering that this generation of iPod shuffle is (at least in my mind) far less desirable than other generations.