New old stock, 2001, AGCO made by Stanley Muffler
5020 and 5030 AC Tractors.
As can be seen in the pictures, there is an AGCO pick ticket and the part is actually a Stanley Muffler. Obviously, AGCO was sourcing these from Stanley.
It has some minor surface rust in the lower, outer elbow. An unnamed mechanic had the habit of ripping boxes open in the parts department and then the part was exposed for rust to set in, unfortunately, this is one of many boxes to suffer.