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Amazon.com : German U-Boat 14th Flotilla cap hat Badge Kriegsmarine WW2 Flottille U-Boot WK.2 'U Boot and Sun' AGED : Sports & Outdoors
Why were the German u-boats in WW2 named 'U+number' (U-101 for example) instead of more uniquely, like the u-boats of other belligerents? - Quora
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