– Although you can take control of the Waffenträger auf E 110 using a special key, there is still a version of it that can only be unlocked by some Wargaming staff and content creators! The Waffenträger auf E 220 has the same statistics as the E 110, but not in terms of spoils.
This is a special version with a unique camouflage pattern that you will easily recognize if you come across it during special time windows. If you and your team can triumph over E 220, everyone on your team will get a special locker! They include even bigger prizes, including premium vehicles and a chance to get a new American heavy tank, the T77!
Source: wotclue
