the Austrians , the Polish and the Russians all 3 used dual headed eagles.. the mug to me looks to be a steel/ iron based mug..with pewter overlay...I say this due to the rust that I see ...looks to be a hunting scene beer mug (stein) to me
It is non magnetic so I think it is pure pewter, the discoloration is not rust. It weighs like 3 1/2 pounds.