Thanks Mart,
The Kijijji ads are actually for the cabinet that I now have, but your Google search did lead me to something in the Canadian Library Archive. An image of the old Southampton factory taken in 1923-24.
I also found some other info on the buildings history:
Vanstone and Morans Furniture Factory, S.M. Knetchtel Chair Company, Sellers Kitchen Cabinets, Bell Furniture
Vanstone and Morans Furniture Factory, Southampton had ceased to operate by 1890.
Samuel Miller Knetchtel operated S.M. Knetchtel Chair Company from this building. His father was Peter Knechtel who operated a saw mill from the mouth of the Saugeen River. The company manufactured all kinds of chairs including high chairs.
Oak kitchen cabinets in three sizes were manufactured by Sellers Kitchen Cabinets, an American Company in the building for a short time.
Bell Furniture also used this building as a chair factory after 1907.