One of the most beloved characters of the film series was Sirius Black, played by silver screen legend Gary Oldman. Excalibur's auctions sale on 28th May features a lenticular poster from The Prisoner of Azkaban which features a disappearing Sirius Black.

Fans of rare Harry Potter memorabilia will be sure to battle over this poster as it is one of less than 10 known to have ever been made. The image changes depending on the angle it is viewed: if viewed straight on it reveals Sirius Black in a ''Wanted'' poster, whilst Sirius disappears when viewed from other angles.

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Adrian Cowdry, Excalibur’s poster & autographs specialist explains: ''Although a large quantity of this image in lenticular style was produced in smaller formats, the costs and complexities of producing this in such a large format meant that less than ten were produced for the Prisoner of Azkaban film. We estimate that this poster will achieve £4 000-£6 000.''

The sale will also include Star Wars Episode II Yoda lenticular, a 1920s Sherlock Holmes window card and a large collection of James Bond themed items, including original UK Quad posters from Dr No and From Russia with Love.

Check out the full catalogue on Barnebys here.