The following may already be known to the Canadian collectors in the Forum, but no harm in duplicating information.
A quick google turned up this very helpful reference, but to steer clear of any possible copyright infringement I am posting the url itself.
The article deals with fonds and there is mention of the firm's production of specific WW1 military insignia.
https://hermis.alberta.ca/paa/Detail...=True&deptID=1
GTB