4 Skilling Våpen 1855: (Nor.) refers to the 1855 4 Skilling blue Norwegian Coat-of-Arms issue.
4-Sidig perforeing: (Nor.) perforations on 4 sides.
40th Anniversary of the Royal Wedding 1947-1987: 1987 Aitutaki overprint.
5-Dollar Prexie: nickname for the U.S. 1938 Calvin Coolidge issue.
7-1-71: issue date of the new USPS emblem, issued at every post office in the nation, creating a new field of specialization.
