3 sheets. Operation Sea Lion, also written as Operation Sealion (German: Unternehmen Seelöwe), was Nazi Germany’s code name for the plan for an invasion of the United Kingdom during the Battle of Britain in the Second World War. This included enlarging Ordnance Survey six-inch maps of important towns to 1:10,000, and overprinting the new brown base map with coloured symbols showing sites of military significance such as airports, railway workshops, docks, bridges. Headed Nur für den Dienstgebrauch! : For Official use only. The 3 sheets folded to A4 size. Mint condition.
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