The magician borrows a coin from a spectator and has it signed. He then puts it inside a transparent case, closing it firmly with four elastic bands.
The case is wrapped in a handkerchief and given to a spectator. Once the handkerchief is unfolded and the coin has vanished and the case is empty.
The magician pulls out from his pocket a box. He opens it and shows that inside there is another box. Opening even this one, he reveals another case and at last another one. He finally opens the last one, and inside is the signed coin.