Reference article
Champion’s Crown (Duck Life 1)
Champion’s Crown is a cosmetic hat for the player’s duck.
How to obtain
Win 
World Championship to unlock this hat, then buy it in the 
Duck Shop for 100 
Coins.
Appearance and use
This hat changes the duck’s appearance without affecting its racing skills. The player starts hatless and can remove a hat without buying another.
Name
The later-edition shop calls this item “Champion’s Crown”. It is often referred to simply as the crown.