1977 Royal Mail "The Twelve Days of Christmas" First Day Cover - London PMK

1977 Royal Mail Christmas FDC – Complete with Original Insert CardAn official British commemorative First Day Cover issued on November 23, 1977, celebrating the traditional carol "The Twelve Days of Christmas" [1.1.1، 1.1.4]. The cover features the full stamp series with official London postmarks. This item comes 100% complete with its original informative insert card, detailing the historical background and lyrics of the festive song. A pristine collectible for philatelists.