Lemmie muddy the waters a bit more. A fellow came into the watch and clock collectors club last year proudly showing his wartime catalogue of D.E. Black, Calgary's premier jeweler of the period, eclipsing even Birks. Black imported silver, jewelery, china, clocks, watches and employed watchmakers as well. As you see, he had a military line, making full sized copies of Marguerite badges in gilt or enamel. My flat backed, enamel example has a deep blue annulus, white petalled flower with black streaks on petals and bronze center with red in crown. It measures exactly 42mm tall and has a sideways brooch fastener to the rear.
I have no doubt that at a time, when an officer was entitled, nay, encouraged to fit himself out with certain 'private purchase' items, either of these examples would have made it into service, wrongly or not.
Note also the previous page showing Canada's versions of the "son in service" pins used extensively in the USA. One example uses stars as in the US and the other uses maple leaves.
Hope this clears up, for some of you, where the enamelled versions came from. He very well may not have been the only jeweler to offer these.