As for how much it would fetch should it go to auction, Mark teased the guest: “It is very, very tiny. It can’t be worth much, can it?
“Now, I have had to do some quite detailed research on this thing because you cannot find these things for sale because they are rare.
“What do you think it’s worth?” he asked with the guest replying: “I really don’t know. Maybe a couple of hundred pounds?”
“£3,000,” Mark revealed. “For something you found in a tin! The rarest badge from World War II.”
Antiques Roadshow airs Sunday evenings at 8pm on BBC One.