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Panoramic view of the port of Hamburg with a large cruise ship and the tunnel under the Elbe below, illustrating its entrance and interior. The reverse features a handwritten French letter addressed to Toulon, a Hamburg cancellation dated August 2, 1975, and a 0.30 marks stamp. The printed text describes the technical features of the tunnel: length of 450 meters, depth of 21 meters below water, and capacity for 14,000 vehicles per hour.