A bill is borrowed and the owner asked to sign it. The bill is folded, and given to the owner to hold and wrapped in a hanky. The performer now produces from his pocket a solid brass tube, which is locked.
The performer walks up to the spectator holding the bill, and whips away the handkerchief. The bill has vanished. The tube is unlocked, and within it is the same signed bill.
A precision machined prop in solid brass!
Note: You must supply your own method for vanishing the bill. You receive the bill tube and instructions for use.