GUEST: This is a baseball that was given to me by my dad. He was born and raised in Washington, D.C., as was his father, and they used to attend the Washington Senators games back in the '20s, and I've had it since a child. I'm embarrassed to say that it was in a basket in the garage for over 20 years at my house, along with soccer balls and basketballs and dog toys, and we were cleaning out the garage and I was ready to toss it, and my husband said, "I think we should check out this autograph and find out more about the ball."

APPRAISER: Well, Walter Johnson, "the Big Train," played all 21 years for the Washington Senators, was the most dominating right-handed pitcher of the time, and a member of the first Hall of Fame class in 1936. The baseball, we believe, is circa 1920s. It's not an official American League ball; it was basically a youth ball. But what I'm most impressed about with this baseball is the condition. It's hard enough to find a Walter Johnson single signed baseball, but to find one that's survived in this condition is incredible. We would put a value on this, for insurance purposes, of $10,000.

GUEST: Whoa, are you serious? That's amazing. That's great!