50th anniversary of the polygon inter- experimental Salto Quirra

€ 0,6 - Sardinia coat of arms of the polygon - Color polychrome - Stamp Perforation 13 ¼ × 13 b - Intaglio printing - Printed from IPZS Rome - 50 sheets - Size 30 × 40 (mm) - Drawing F. Simoncelli - Circulation 3.500.000.