Double Side Coin Half Dolar (Heads)

Imagine this, the magician writes a prediction and hands it to a spectator to hold without looking at it or showing it to anyone. He then asks several spectators to take out the coins they are carrying and place them on the table. A spectator takes the coins, mixes them in his hands and drops them on the table. The face coins that have a year written on them are the ones that continue to be played and the back ones are discarded. Once there is only one coin left, the viewer is told to read the year of that coin and upon opening the prediction the year will match. No complicated manipulations needed.