Pictures Bloomsbury to auction Patronus postcards to celebrate ‘Azkaban’ 20th anniversary Cheetah (Rob Biddulph Patronus on a Postcard) ← From Bloomsbury to auction Patronus postcards to celebrate ‘Azkaban’ 20th anniversary Patronus on a Postcard 2019 Harry Potter Prisoner of Azkaban Explore all Wizarding World pictures →