Works on all 3 servers. Gives 7 days of premium time, 500 gold, and a Churchill III (tier 5).
CZOLGISTA Works on EU only. Gives Pudel (tier 6), garage slot, 7 day premium. Hands down the best invite code in existence. You can use this link too for making an account (it’s in Polish): https://pizzaczolgisty.pl/ Apparently WG decided to silently remove this code. Used to work late in 2019.
Works on NA only. Gives the removed Tier 5 T-14 US Heavy Tank, 1,000 gold, 6x 50% EXP (2hr) Boosters, 6x 25% Credits (2hr) Boosters. Good until December 30th, 2020
Works on NA only. Includes 3 tanks: T-127 (tier 3) & Pz T 15 (tier 3) & T2 Light Tank (tier 2), plus 3 days of Premium time and 100 Gold.