Canada
can-19780000-b-001
page = 1
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Width: 240 mm
Height: 107 mm
Location: Box 1001
Stamp ID = 4409
Business envelope for CAN/AM Hockey Group. CAN/AM Hockey Group is a company that specializes in youth and adult hockey tournaments & camps. See can-19780000-b-002 for another variation of this company's business 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.