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Stamp picture
Click here for higher resolution image
First day of issue: July 03, 1968
Width: 56 mm
Height: 89 mm
Perforation: Perforated 10.00 x 10.00
Location: Lacrosse & Ringette
Stamp ID = 6328

Upper right corner block of 4 from field stock sheet. See can-19680703-as-001 for more details.

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.