But that doesn't quite fit the scenario the dawg put out there.
Try this: a guy and a companion walk into a pawn shop; the guy hands the "gold" watch to the pawn broker, saying "I inherited this and need some money; is it real gold? What will you give me for it?"
That sort of question probably happens all the time.
The broker examines / tests it, openly or not, then tells him whether it's real gold and names his price.