You've found a vintage Chambers thermowell pot lid! This Mirro deep well cooker / hi-speed thrift cooker cover measures 8.75" diameter at its widest. This replacement part for an antique chambers stove has discoloration from normal age and use. The knob is chip- and crack-free. This aluminum lid has a design with three indented rings and a vent hole. The black knob is recessed in the center of the lid.

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