A Kirby family crest mystery?

One possible route for tracing our family’s ancestry was our alleged coat of arms and crest (see below). Apparently, when my mother first met my father’s parents, there wasn’t a piece of china or silver that didn’t have the crest on it. She also remembers her future father-in-law making a big deal about her family coming from trade and even saying how lucky she was to be marrying my father.