This is a complete set of mint never hinged stamps issued by the Vatican City in 1991.   The year set contains the stamps in the pictures (with Scott numbers):

870-81       Restoration of the Sistine Chapel

882-4         1st Centenary of Encyclical "Rerum Novarum"

885-7         1st Centenary of Founding of Vatican Observatory

888-9         6th Centenary of Canonization of St. Brigid

890-4         Journeys of John Paul II in 1990

897A         Synod of European Bishops


You can find more Vatican philatelic items at my web site www.pennyblackstamp.com

Thanks for looking.