Coins of what currency were melted down to make rugby union's Calcutta Cup?

I live in Rugby and obviously know the history of the game starting at Rugby school by William Webb Ellis, but I didn't know the connection with the cup interesting.

Never knew this. What they did was brilliant and now it’s been updated to questions like this Well done to them

so cool to think that this has been such a lasting legacy....

I used to live in rugby

Always wondered why it was called the Calcutta Cup brilliant story!

me is ccool