He was sent to have an X-ray to prove he's old enough to be an antique before being auctioned.
His owners claimed he was over 90 years old and made by a famous old German toymakers called Steiff.
But auctioneers needed proof. There are two ways they can spot a genuine Steiff teddy:
Percy had the button in his ear, but as Clare Rawle from the auctioneers explained: "The only way to be sure is to pull him to bits, which isn't very good for him, or to X-ray him. So we booked him in!"
- If it has a special button sewn into its ear
- If it has a metal rods holding its limbs together
And now that Percy's proved his "mettle", the 92-year-old could fetch up to £1,500 when he's sold next month..