Formed as bird heads, possibly kingfishers or herons. They are of hollow construction, with a molded piece of copper fused to a sterling silver backing. One bird head has a 3/16-inch-long separation between the two layers along the side. It is surrounded by a darkened area, but the metal appears stable. (See photo 6.) The pin backs have secure C-clasps. The backs exhibit cryptic marks that appear to be portions of the word ‘Mexico.’ Each pin measures 1 ¼ inches by 1 ¼ inches.