The Second World War - Sir Winston Spencer Churchill 1948 to 1954 - Cassell and Co. Ltd., London - First Editions ‘I will leave judgements on this matter to history – but I will be one of the historians.’ - Winston Churchill.

Churchill’s complete six volume classic history on World War II -
The Gathering Storm, Their Finest Hour, The Grant Alliance, The Hinge of Fate, Closing the Ring and Triumph and Tragedy.
  Not since Julius Caesar and his Gallic Wars has there been a case of a great leader in war also being an able writer.

The Nobel prize for literature is given for a lifetime of written work, and there is a rule against its being awarded to politicians. This set convinced the Nobel award committee to waive that rule.

Named ‘Number One Non-fiction Book of the Century’ by
National Review.

References: Woods,
Bibliography of the Works of Sir Winston Churchill A123(b). Langworth, A Connoisseur’s Guide to the Books of Sir Winston Churchill 264.
Six volumes. pp. [2]xv [1] 640 [2]; xvii [1] 684 [4]; xviii 818 [2]; xviii 917 [3]; xviii 673 [3]; xviii 716 [2].
  Six volumes smartly bound in recent half navy blue morocco over blue cloth, raised bands, titles and 'lions rampant' tooled in gilt to spines, top edges gilt.   Condition: Fine   Ref: 107128   Price: HK$ 11,500