Canada
can-20140000-b-001
page = 1
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Width: 238 mm
Height: 104 mm
Location: Box 1002
Stamp ID = 6939
The Okotoks Oilers are a Canadian Junior A hockey team based in Okotoks, Alberta playing in the Alberta Junior Hockey League from 2005 to 2022. The team played in the Murray Arena, among others.
This envelope was mailed with a US stamp. The city of Okotoks is near Calgary and is not that close to the border. Perhaps the team secratary that mailed the envelope was on the team bus while on the road to game in the US.
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.