I imagine the shaft of the clapper is wrought Iron. Over time the bashing of metal against metal will work harden the less "sophisticated" of the metals. Bell metal is designed to do what it does and do it for ever it seems. The wrought iron should be able to be forged back together by a skilled ornamental black smith.

There should be people in the region who do this work. Historic preservation is a grownig trade. Contact someone who offers steeple jack services and look for a recommendation there.

Don