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Stamp picture
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First day of issue: October 27, 1987
Occasion: 1988 Winter Olympics,1988,Calgary,Canada
Width: 66 mm
Height: 88 mm
Perforation: Imperforate
Printing method: Lithographed
Catalog number:
     Michel Block175B
Location: Ice Hockey Volume VI
Stamp ID = 143

From Linn's "Stamp Issuing Entities Of The World" page.

Bulgaria (1879-)
Stamp-issuing status: active; Population: 8,652,745.