This is a cooker manufactured by AGM (American Gas Machine) Co. for the U.S. military during World War II. It's made of sturdy aluminum and measures approximately 20.5 x 22.5 x 13.5mm in height. It's like a smaller version of the pots used for school lunches in the Showa era. The body and lid are stamped with "US A.G.M CO". It's a very old item, so it has scratches, but there are no major dents. Completely unrelated, but four SVEA 123 stoves fit perfectly inside.