Vintage MCM Rochester Copper Chafing Parts 9" Round Dish w/Lid

Vintage MCM Rochester Copper Chafing Parts 9" Round Dish w/Lid. I think this is part of Chafing Dish Set. The dish measures approximately 9" round and tapers down to 7" round at bottom. It is stamped Rochester on the bottom. Comes with matching lid. Made of lightweight metal--I think is is copper. It is non-magnetic. They do have some tarnish and spots on the outside and could use a good cleaning/polishing. Please see pictures.