I just bought this pan at an antique store. It is 12" long oval, 8.25" wide and 1.75" deep. Weighs 1 lb 10.5 oz. Has rolled edges and two rivets per brass handle. It has two marks on it. The first is i believe a partial circle with COPR * (along the top of circle) MA* (in the middle of the circle) and PO* (on the bottom of circle). I think this would mean (MA) Made in (PO) Portugal But I do not know what CORP is. The second is an engraving of a duck on the bottom of the pan. Also the rivets on closer inspection, seem to be made of copper and are colored a tin color? I have checked out the oldcopper.org website, with no results.
Any help would be appreciated. Thank you.