Burundi B 52-B55, CB22-CB25, B55a, CB25a imperf, MNH, $23.50. Michel 816-823, 824-831 Bl.56-57 UNESCO campaign to save the Treasures of Venice, 1971. Paintings by Pietro Longhi, Byzantine icon, Giovanni Batista Pittoni, Vievs of Venice: Casa D'Oro, Doge's Palace, Church of Sts John and Paul, Doge's Palace and Plazzetta at Feast of Ascension by Canaletto.