These were produced by Delandre, probably around 1916. There is an interesting write-up about Delandre on the Rigastamps website:http://www.cinderellas.info/columns/Delandre/index.htm
See in particular Figure 4 from the article, which is a stamp that has a similar look to the Canadian Red Cross stamp.
Delandre was eventually arrested for printing his own versions of Red Cross seals, which landed him in prison in 1917, and where he died in 1923.
Delandre produced many thousands of stamps during his short career, and these have become very popular with Cinderella collectors, as most have military themes, and are very beautiful multicolored creations.
There is also a wonderful gallery of Delandre stamp images available on the web at:http://vignettesdelandre.free.fr/