Canada
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Width: 165 mm
Height: 112 mm
Location: Oversize album #11
Stamp ID = 5181
This plastic shield has the Toronto Maple Leaf logol raised on its surface as protection for the cloth logo on souvenir sheet can-20171024-w-001 while in the specialiezed booklet can-20171024-z-004.
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.