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Pictured: Hand-Drawn by Ralph McQuarrie Darth Vader and Luke Skywalker at the Cloud City window from The Empire Strikes Back.

Original concept drawings for The Empire Strikes Back have emerged for sale for thousands of pounds.

The sketches of Darth Vader and Luke Skywalker were hand-drawn by illustrator Ralph McQuarrie for the sequel to Star Wars.

He depicted the two Jedi Knights during their lightsaber duel in Cloud City - the famous scene in which Vader tells Luke 'I am your father.