http://www.ebay.com/itm/401070982089

This was made in the early-mid 1940s, with a patriotic shield in one corner and a four door sedan (Lasalle? Packard? It’s abstracted enough that it’s hard to tell) in the other.  The initials BDC are in the center. It measures 1-3/4″ across and best fits a 3/4″ belt.