“And what we have here is a fabulous, big size in the hand, hunting-case watch.”
Richard dated the watch around 1910 before revealing he hoped the value would “surprise” the owner.
The expert added: “The certificate, Audemars Piguet, and it’s all there from presumably the South American retailer.
“So, collectors love things in mint condition and Audemars Piguet are known for making the loveliest, loveliest-quality goods, particularly complicated things like this.
“It wouldn’t surprise me, and I hope it surprises you when I say it’ll fetch between £10,000 and £15,000.”
Antiques Roadshow returns next Sunday at 8pm on BBC One.