Gas tank from a parts lot. It was unmarked but from looking and research I believe it belongs to a 1981-1982 Yamaha XS400 special. Please make sure it is what you are looking for before purchase. Please look over pictures closely. Tanks has dents, rust, wear, and tear. Old original part. The inside is in pretty nice condition.  The one side has a pretty big dent, and the fill neck is dented in some. Thanks for looking