1737 - 1978 15c Medallion Roses - Mystic Stamp Company。1867 15¢ Lincoln Z grill sets record in Cherrystone sale of New。1305E - 1978 15c Prominent Americans: Oliver W. Holmes, Vertical。1502 - 1973 15c Progress in Audio & Visual Electronics - Mystic。15 stamps + AlbumTheme: Nelson Mandela, Peace