Champagne Jam What Is The Significance Of Jamming A Fifty Pence Piece Into A Bottle Cork?

What is the significance of jamming a fifty pence piece into a bottle cork? - champagne jam

Recently, I received a bottle of champagne with my other half for holding the test results. As we drank, his grandmother cut a corner in the corner of cork and a piece of 50 pence on it. She said it was the bottle that we remember for our results. Never heard before of this tradition, and wondered what the importance of IT.

Can someone enlighten me?

Thank you.