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desc_issuer: United States desc_year: 1937 desc_denom: 20c Related descs: issuer=United States-1936-3c issuer=United States-1938-2c Not used by any overprinted stamps. Used by 9 (0 visible) images: See images as array Matches 1 type: United States airmail 2/15/1937 20c grn d=China Clipper over Pacific unwmk perf=11 |