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Stamp picture
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First day of issue: June 28, 1952
Occasion: 1952 Roller Hockey World Cup,1952,Porto,Portugal
Width: 30 mm
Height: 21 mm
Perforation: Perforated 13.00 x 13.50
Catalog number:
     Scott 750
Location: Roller hockey
Stamp ID = 3140

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

Portugal (1853-)
Stamp-issuing status: active; Population: 9,867,654 (1997 estimate). A republic on the western coast of the Iberian Peninsula in southwest Europe.