Canada
can-19820000-b-003
page = 1
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Width: 235 mm
Height: 105 mm
Location: Box 1001
Stamp ID = 6843
Business envelope for the International Hockey League. The league office was in Windsor, Ontario, Canada until 1983 when it switched to Indianapolis, Indiana, USA. See usa-19830000-b-001 for the USA office envelope.
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.