1943 ‘YANKEE CLIPPER’ PORTUGAL. On February 22 1943 at 6.47 p.m. a Boeing 314 Clipper, was landing on the Tagus River, Lisbon, Portugal, when the left wing tip skimmed along the surface of the water, dug in and the plane crashed into the river, killing 24 of the 27 passengers and crew. It remained partially submerged for approximately 10 minutes, then disappeared below the surface of the river. This censored cover from New York, has a boxed violet ‘DAMAGED BY SEA-WATER’ cachet on the front. On the back is a London ‘Officially Sealed’ label.