That's called a rouleau vase. And that rouleau shape was a shape that was prominent, and you find in porcelain made in the late 17th and early 18th century. GUEST: Oh. APPRAISER: So we're going ...

In one memorable episode, a working-class couple sought the verdict on their 16-inch tall porcelain vase, only to be informed by the programmes connoisseur that it was a "very clever reproduction".