A Theory for the Marks on Josef Jakobs’ Shell Touring Map
When German spy Josef Jakobs parachuted into a potato filed on Dovehouse Farm the night of January 31, 1941, he had a Shell Touring Map in his possession. The map was a fold-out variety and relatively small-scale. Not the best map for a would-be spy! When MI5 examined the map, they noticed that a triangle […]
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