Vintage Copper Brioche Cake Jello Bundt Mold from Portugal

This is a classic brioche or bundt mold or mould that has stood the test of time. The maker's mark stamped on the side is partially worn away but you can read "made in Portugal". It has a chunky feel and it has a really beautiful patina. It has be molded and hand hammered. It has a steel lining or is it tin?? (I think) that has slightly darkened through time and I'm not sure if it's rust or ? (see photo). This is a vintage example of a classic, traditional design that will be looking fabulous on your wall or shelf. It is in good condition see photos. The two different color photos are taken both in a warm and cool light. It measures 7.5 inches in diameter and 3.5 nches deep.