V. B. Simkins Sewing Machines in Kingston, Ontario claim to be the
oldest sewing machine store in Canada, existing since the 1860s, and I
have found no reason to doubt that statement. There seem not to be any
other businesses asserting this claim; at least I could not locate
A funny detail: In the company history on the store's website, current
owner Eric Simkins is called "Mr. Sewing Machine Man", which is by
chance very closely resembling your screen name.
Here is full contact information for the company:
V. B. Simkins Sewing Machines
181 Sydenham Street
Ontario K7K 3M1
Phone: (613) 546-6110
Fax: (613) 546-6110
Hope this is what you were looking for!