The fourth season opens with a truly historic find: a 65-million-year-old dinosaur bone found in Mississippi. Purchased for a mere $450, the bone is priceless, according to the paleontology museum curator who appraises it. In subsequent episodes, the duo will "pick" a speedy cycle car, crafted from the wing tank of a WWII-era plane; the work of iconic painter Norman Rockwell; a 350-pound taxidermy African elephant head, which they ultimately swap in exchange for a vintage photo booth and jukebox; and two coin-operated "peek-a-boo" strip poker machines from the 1950's. As Mike and Frank demonstrate, no two treasures, no two adventures and no two episodes are alike.