The Canadian mark is that of the manufacturer, the English one is that of the importer.  There have been some earlier discussions; if you go to the "Quick Links" box at the top of this page, select "Search the Forum" and type in harmonium, you'll find some.  Two particularly useful URLs (courtesy of Joe Offer and Katlaughing) are:  The Harmonium Homepage  and  The Reed-Organ Homepage.

Malcolm