Three brass caps, cover three coins, 2-5p and a £1 coin
After mixing up the caps, the spectator is asked to follow the £1 coin
After failing to do so, 1 cap is removed, leaving 1-5p and 1-£1 coin
the two remaining coins are covered with 2 caps, and the one covering the £1 coin is marked using 1p coin.
when caps are removed all that remains is 2-5p coins, and the £1 coin is under the cap that was removed.
simple to do requires no slieght of hand