The picture shows a view of all (4) Brass Metal Mack Truck Bulldog Advertising Character Pins in this lot. The back sections are not shown but they are all included. These are not dated and the year that they were made is unknown. They are not marked and the maker is unknown as well. Each is marked with ''MACK'' on their collar and they are wearing hats. One has a fireman's helmet, one has a cowboy hat and two have construction worker hard hats. The pins measure about 3/4'' tall. One duplicate with a hardhat has some wear to the paint but the other three appear to be in mint condition as pictured.