Vintage, decorative, copper, tin lined, jello or cake mold. The shape is round and fluted with rings. I'm not sure what to call this design, but it's fluted with rings in different shapes. It is stamped iagus, Portugal.
It measures 8 7/8" across the widest part x 2 1/2" deep. There is a brass ring on the top to hang it on the wall.
It is used but in good condition with a some scuff marks but no dings or dents.