Guatemala C517-C522, C523 sheet

Guatemala C 517-C522 block of 6, C523 sheet of 2, overprinted in black, MNH, $15.90. Michel 979-984, Bl.16a, Euros 23.00. UPU-100, 1974. Arches - Antigua, Cathedral, Fountain - Central Park, Capuchin Monastery, Fontain and Santa Clara, Portal of San Francisco.