Those sort of tags, plates and badges were, and still are, punched out in their masses by loads of companies for a multitude of uses- the shield was popular like oldbiscuit said, also discs, rectangles, scalloped edged variations etc. Plus, if it’s only 1/32″ of an inch thick and you found it buried in the ground then it’s unlikely to be that old- brass that thin wouldn’t last long unless it was bone dry in a desert!
