Denmark 1960/1985 48 pcs First day cover issue collection of 48 first day covers from Denmark spanning the years 1960 to 1985. These covers likely feature stamps issued during this period, each cancelled with a special “First Day of Issue” postmark from Denmark. First day covers are envelopes or postcards bearing stamps cancelled on the date they were first available for postal use. Collecting first day covers became popular in the 1920s, especially with the issuance of commemorative stamps. These covers often include pictorial cachets, which are commemorative illustrations related to the stamp’s subject. The covers can be addressed or unaddressed, with some collectors preferring covers that have passed through the mail for added historical value. Additionally, some first day covers can be quite unique, such as those issued in multiple cities or on special occasions like stamp exhibitions or joint issues with other nations