1960 Sc 2330-2331 Moon studying by means of Automatic Interplanetary Stations. Scott 2309-2310

1960. Moon studying by means of Automatic Interplanetary Stations.
Catalog numbers: Scott 2309-2310, Standard Collection 2330-2331, Michel 2336-2337, Yvert 2273-2274.
Perforation: comb 12 x 12½.

Colors: Multi-color.
Printing: Intaglio and offset. Comb perf.

Print run: 2,500,000.