Genus species: Agaricus silvaticus

Series: Mushrooms I (Bulgaria 1961)
Catalog codes:
- Michel: BG 1264
- Stamp Number: BG 1184
- Yvert et Tellier: BG 1100
- Stanley Gibbons: BG 1275
Emission: Commemorative
Perforation: comb comb 12¾ x 12½
Printing: Offset lithography
Colors: Multicolor
Print run: 3,000,000
Face value: 4 ст - Bulgarian stotinka

Reference: Colnect.com
Shop now link: ebay.com (note: market availability)