14th world conference on general relativity and gravitational physics

750 £. - Basilica of Santa Maria del Fiore in Florence and portraits of Galileo and Einstein - Color polychrome - Perforation stamp 14 × 13 ¼ b - Offset printing - Printed from IPZS Rome - 50 sheets - Size 40 × 30 (mm) - Drawing C. Bruscaglia - Circulation 3.000.000.