Who is Michael Galbraith?

This Good Luck charm came to the surface in our garden a couple of years ago. I put it in a drawer and rediscovered it recently. Curious about the previous owner of this lucky charm,I put the name of Michael Galbraith into Ancestry.com, hoping to find out who he was. No luck. I can't find anyone by that name who lived anywhere near Mansfield. So how did his charm end up in my garden?  One of life's great mysteries.