Bulge, check your Superposed for long tang or short tang, almost everyone agreed there're no salt wood on long tang Superposed.
Superposed were made in Standard, Pigeon, Pointer, Diana, & Midas grades from '60~'76.
Midas grade has ducks and pheasants on frame, and quail on the bottom with gold inlaid. Firing pins and ejector hammers are gold plated.