£120
CONFIDENTIAL 'WAR INSTRUCTIONS FOR BRITISH MERCHANT SHIPS', AUGUST 1917: A rare copy of the Admiralty's official publication C.B. (Confidential Book) 415, individually numbered Copy No. 3756, containing secret instructions issued as a precaution against the German navy's attempts to sink allied shipping, August 1917, with printed note to front pastedown 'This book is weighted with lead, and if thrown overboard will sink'. Contains numerous 'Convoy Zig-Zag' diagrams, allied and enemy submarine silhouettes, and black and white photographic plates of mines and torpedoes, original blue buckram with lead-weighted covers (for rapid disposal at sea).
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