This is copper and dates back to about 1900. This is copper lined with tin on the inside. Some of the earliest chocolate molds were made with copper. The detail on this is just exquisite. Stamped Matfer just below the beak on one side. About 4 1/2 inches tall and 4 1/2 inches wide. Has a lot of patina and verdigris. Inside is lined with tin and has a few small rust spots.