Full Pane of United States 4-Cent Dag Hammarskjöld Commemorative Postage Stamps (1962 Special Retransmission)

This is a full philatelic pane containing 50 unused 4-cent United States postage stamps (arranged in a 10x5 grid) commemorating Dag Hammarskjöld, the second Secretary-General of the United Nations. Each stamp features a sepia-toned monochromatic portrait of Hammarskjöld beside the United Nations building. A notable feature of this specific sheet is the yellow background color, which characterizes the famous 'Invert' error. This sheet represents the intentionally mass-produced 'Special Printing' or 'retransmission' (Scott #1204) authorized by Postmaster General J. Edward Day shortly after the discovery of several legitimate invert error sheets (Scott #1203). The sheet is printed on white paper with perforated edges separating the individual stamps. The top margin (selvage) displays the plate number '27276'. The construction shows standard gumming on the reverse side, though the face exhibits significant vertical and horizontal rippling, likely due to improper storage in a high-humidity environment or curling from the original adhesive. There are visible creasing and handling marks across the pane, suggesting it has not been kept in a protective rigid sleeve. The overall tone of the paper is slightly cream-colored due to natural aging since its 1962 issuance.