The Liberty Bell is a well-known symbol of freedom in the United States.

The bell was first made in 1752 for the Pennsylvania State House, now known as Independence Hall. 
The bell was cast in London, England, and shipped to Pennsylvania. Soon after it arrived, the bell had cracked.Two Philadelphia foundry workers named John Pass and John Stow were given the cracked bell to be melted down and recast. They added an ounce and a half of copper to a pound of the old bell in an attempt to make the new bell less brittle. For their labors they charged slightly over 36 Pounds. 
The new bell was raised in the belfry on March 29, 1753. 

Liberty Bell: 1753 - Ben's Guide

https://bensguide.gpo.gov