I can't speak to the Canadian vs US differences, but I had always heard that grommet location and the Veribrite stamp were key indicators of originality. Also, my Veribrite sign has good shelving to the porcelain. Maybe the Canadian signs were made by a different company, which could result in the grommets being in a different place and the shelving being different...I don't know. Here is my Veribrite sign for reference.

BrianH

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Brian H