Thx Steve! I read the Char Valley Brewery eventually became the Duquesne Brewery which are more common. The Pittsburgh piece appears to be a license, 1916 at the bottom. Thinner brass than the other chauffeur licenses I’ve found.
Unless he has giant fingers, the tag only appears to be 2 inches long or so, which isn't too big for an older dog tag. Here is a 1937 version, and it is about the same length and has basically the same information and order of presentation.