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desc_issuer: United States desc_function: airmail special delivery Not used by any overprinted stamps. Not used by any images. Matches 2 types: United States airmail special delivery 1934 16c bl d=Great Seal of the United States unwmk perf=11 United States airmail special delivery 1936 16c red&bl d=Great Seal of the United States unwmk perf=11 |