lot of 3 antique Griswold New American stove pipe dampers

Lot of three old and antique Griswold cast iron stove pipe dampers for wood burning stoves. Two of these dampers are 6" and one is a 5" damper. One of the 6 inch dampers is marked with the Griswold cross logo and is labeled as "American". The other two are both marked as "New American" dampers. These are from an old farm estate and are all rusty.