Sky History Saturday

Two previous champions go head to head in a five-hour forging round making their own signature san mai blades

Previous champions face-off in a brutal five-hour challenge, where they have to pick a box and build a signature blade using whatever method is inside

The guys examine a letter from Founding Father James Monroe and a promotional Playboy chair. Chum tries to reinvent himself in the image of Hugh Hefner

Corey checks out a 1972 telegram that prevents Muhammad Ali from fighting in Alaska, and a first edition copy of Oscar Wilde's The Happy Prince arrives in store

A 1957 Harley-Davidson Sportster roars into the shop, and Rick takes a look at a painting of Vietnamese Communist leader Ho Chi Minh

Rick unrolls work by Shepard Fairey, the artist that produced the famous President Obama posters. Corey and Chumlee look for a deal on a Mork figurine

The guys check out the smashed guitar of Kiss frontman Paul Stanley, Thomas Jefferson's personal copy of Jay's Treaty and a Brown Bess musket

Evidence that ties a meteor strike to a Biblical tale. Plus, the treasure-filled tunnel revealed by a sinkhole in Mexico