This vintage necklace features a marbelized blue stone pendant in a square shape, with a bulldog design that represents the iconic Mack Trucks brand. The necklace is from the 1970s and has a chain style, making it a fashionable accessory for any vintage or antique jewelry collector. The material and metal used for the necklace are unknown, but the pendant is in great condition and would make a nice addition to any jewelry collection.