Canada
can-19590420-b-001
page = 1
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Width: 163 mm
Height: 93 mm
Location: Box 2006
Stamp ID = 4403
Note the use of a Canadian stamp and an American stamp. Stamp is canceled in Canada.
From Linn's "Stamp Issuing Entities Of The World" page
Canada (1851-)
Stamp-issuing status: active; Population: 29,123,194. An independent state within the British Commonwealth, occupying the northern part of North America.