Vintage/antique trillium brooch in sterlig & enamel signed BMCo

This pretty flower, measuring about 1 inch in either direction, likely dates from mid century or earlier. Crafted of bright and translucent enamel over sterling silver (guilloch╬), it was created by the Breadner Manufacturing Company, which was founded in Ottawa c.1900 and moved to Hull, Quebec in 1956. Marked Sterling BMCo. In very nice condition. On one petal, there is a tiny blackdot and a very light line running across the petal's own lines. Very hard to see but I have tried to display it in the last photo.