GUEST: I mean, it looks like something that came from a cannon or a gun, but I got it at a yard sale for three dollars...
APPRAISER: Impressive.
GUEST: ...to use as a doorstop.
APPRAISER: What it is is a Civil War cannon projectile.
GUEST: Okay.
APPRAISER: It's three inches across...
GUEST: Mm-hmm.
APPRAISER: ...and it fires out of a three-inch rifled cannon.
GUEST: Mm-hmm.
APPRAISER: They call it an Archer shell. And they call it a shell because at the top, we have the fuse hole.
GUEST: Mm-hmm.
APPRAISER: And that's where the powder went inside, and it would have had a wooden plug that seated down inside the hole.
GUEST: Oh, okay.
APPRAISER: And it had a wick that came out of the top...
GUEST: Mm-hmm.
APPRAISER: ...called a time fuse. And it would have burned like a wick until it was time for the cannon shell to explode.
GUEST: Like a firecracker.
APPRAISER: Exactly, just like a firecracker.
GUEST: Yeah.
APPRAISER: If the fuse was still in it...
GUEST: Mm-hmm.
APPRAISER: ...and it was airtight, the powder would still be live. Recently, there have been a, a couple of accidents from trying to disarm the pieces manually...
GUEST: Mm-hmm, mmm.
APPRAISER: ...that have caused serious injury.
GUEST: I thought gunpowder disintegrates over time.
APPRAISER: No.
GUEST: No.
APPRAISER: And now, and see, that's a common misconception.
GUEST: Really?
APPRAISER: Because if it's airtight, it's still live. The shell itself is made of cast iron. The top part...
GUEST: Uh-huh.
APPRAISER: ...and the middle body is iron.
GUEST: Uh-huh.
APPRAISER: This, you know what material that is?
GUEST: Mm-mm.
APPRAISER: It's lead. This is what they call a lead "sa-bit" or "sa-boh." This was fired out of an ordnance rifle, a rifled cannon. And lead is a softer material than the iron of the body of the shell.
GUEST: Mm-hmm.
APPRAISER: And so when you load the cannon, you have the powder behind the shell here at the bottom...
GUEST: Okay.
APPRAISER: ...and when the powder charge explodes, the force from the explosion spreads the lead out.
GUEST: Mm-hmm.
APPRAISER: And as it goes down the cannon barrel, it spins, it goes on the lands and grooves of the barrel, causing it to go further and be more accurate.
GUEST: And does the fact that this is still on it mean it was, means it was never fired?
APPRAISER: Probably, because we can't see the lands and grooves. This one's in very nice shape. If you had to guess, what's your three-dollar doorstop worth?
GUEST: A friend of mine who belongs to the Stone Mountain Historical Society thought maybe $500.
APPRAISER: Well, he's close. One in this pretty shape...
GUEST: Mm-hmm.
APPRAISER: ...with the sabot, would bring about $1,500, retail.
GUEST: Oh! Okay.
APPRAISER: But is the door that it's holding a $1,500 door?
GUEST: No.
APPRAISER: We need to get it away from that door. (laughs)