1951 Sc 1506-1508 People’s Republic of Bulgaria Scott 1542-1544

1951. People’s Republic of Bulgaria.
Catalog numbers: Scott 1542-1544, Standard Collection 1506-1508, Michel 1541-1543.
Issued on: January 13, 1951.
Perforation: line 12½.
Printing: Photogravure.
Colors: Multicolor.
Face value: 25 Russian kopek; 40 Russian kopek; 60 Russian kopek.
Quantity: 1,000,000; 1,000,000.