GUEST: This is the pocket watch of President William McKinley. He's my great-great-uncle. It's just been passed down from generation to generation. I've had it for about six years, and it's been in a, uh, safety deposit box ever since.

APPRAISER: It's a Hampden from the Dueber-Hampden Watch Company of Canton, Ohio.

GUEST: Okay.

APPRAISER: It's a solid 18-karat-gold case. It's a high-jeweled movement, and we see on the outside, it's got the initials of President McKinley. There's a phenomenal presentation. It is crisp and clean. It looks like this was engraved yesterday. This watch was given to him at the time that he was governor of the State of Ohio. The Dueber-Hampden Watch Company of Canton, Ohio, gave him one of the best watches you could hope to get...

GUEST: Wow.

APPRAISER: ...that came out of their factory. He was our 25th president.

GUEST: Mm-hmm.

APPRAISER: And you know a little more.

GUEST: He was assassinated. 1901.

APPRAISER: In 1901. Six months into his second term in office, very sad, very tragic. What we got here is a crossover collectible. Not only would watch people go crazy for this-- and it's a great American collectible watch-- it's a politically important piece of Americana and American history. In a retail setting, this watch should bring easily $30,000 to $35,000.

GUEST: Really? Wow. I was thinking $1,000 or $2,000. My mom used to wear it, put it on a chain and wear it to cocktail parties.