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Source:
Colnect
Issued by:
Bulgaria
Function:
postage
Date:
9/20
/
1971
Issue:
Bulgarian People’s Republic, 25th anniv.
Denom:
13s
Color:
Design:
Bulgarian flag
Watermark:
unwmk
Perf:
13.5x12.75
Catalog value:
Prev:
2s d=Statue of Republic
Next:
13s multi issue=Congress of Biochemistry, Varna d=Double Helix of DNA perf=12.5
External links:
Colnect 371404..lic_25th_anniv
Record of changes