Hello Jennb,
Essentially this is not a Wanzer (ie Canadian) machine, it is a Clemens Muller (ie German) machine, a vibrating shuttle, sold through Wanzer and Co of London. Whether they were anything to do with the Canadian Wanzers (which I think unlikely, because they ceased trading in 1892) or a firm of importers that kept the Wanzer name after the Canadian company went out of business, or was run by someone with the same surname, I do not know. There were lots of companies in London importing German machines prior to 1914.
Alex Askaroff of the Sewalot website is well up on Wanzer and on London importers of German machines. Why not email him?
There are plenty of photos of Muller vibrating shuttles just like this on the Needlebar website.