N.d., (c.1943-44), V + 265 pp., 194 photo-ills., & diagrams, 2 of which are fldg., & 1 is also coloured + other folding pages. Re-bound as a hardback in red cloth covers with black cloth spine ; gilt ; a rear pocket added containing a several page print-out from Wikipedia about the Cromwell Tank ; 29 x 22cm. Numerical stamp to reverse of frontis., which has a closed blind tape repair to the top ; o/w V.G. The Cromwell tank, officially called Tank Cruiser, Mk VIII, Cromwell (A27M), was one of the most successful of the series of cruiser tanks fielded by Britain in the Second World War. It was the first tank put into service by the British to combine a dual-purpose gun, high speed from the Rolls-Royce Meteor engine, and reasonable armour, in a balanced package. Its design formed the basis of the later Comet tank. The Cromwell first saw action in the Battle of Normandy in June 1944. The tank equipped the armoured reconnaissance regiments of the Royal Armoured Corps in the 7th Armoured Division. This confidential Service Instruction Book, "Not to be Published," was a Preliminary Issue to the Official Instruction Book and was intended to be considered obsolete on publication of the latter but it was required in the meantime'"In view of the urgency of providing some details of the Cromwell I A.F.V." A few gaps have been left that were planned to be included in the Official Instruction Book. This Service Instruction Book gives comprehensive details of the Cromwell I and was compiled to assist personnel in the running and maintenance of the vehicle. It is divided into two main sections ' Section A : Operation and crew maintenance of the vehicle, including adjustments ; Section B : Detailed description of all parts of the vehicle. This book also contains a Workshop Instruction Book, in Section C, which was prepared and made available to workshop personnel and those on the Distribution List of the War Office, W.S.5. This section includes specifications suitable for workshops and instructions for the removal, replacement and repair of all assemblies. This book is illustrated with 194 photographs and diagrams, including two folding plates, one of which is also coloured, as well as other folding pages. This was one of the first publications to be issued on the Cromwell I, hence it is so RARE because preliminary copies will often have been destroyed once the Official Book was issued.