Genus species: Pleurotus ostreatus

Series: Mushrooms I (Bulgaria 1961)
Catalog codes:
- Michel: BG 1269
- Stamp Number: BG 1189
- Yvert et Tellier: BG 1105
- Stanley Gibbons: BG 1280
Emission: Commemorative
Perforation: 12¾ x 12½
Printing: Offset lithography
Colors: Multicolor
Print run: 300,000
Face value: 1.25 ст - Bulgarian stotinka

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