80th anniversary of the Vatican's observatory at Castel Gandolfo

€ 0.80 - Pope Pius XII and Castel Gandolfo - Polychrome color - Perforation 13¾ stamp b - Offset printing - Printed by Printex , Malta - Sheets of 10 - Size 40 × 30 ( mm ) - Drawing D. Longo - Circulation 150.000 .