This is a vintage Explorer pocket knife. It has a Hi-stainless, which in those days indicated an ATS-34 or AUS8 equivalent, blade and ebony handles with brass bolsters...
This is a small Edge Mark 11-120 squirrel hunter of quality Japanese construction. It is a fantastic vintage knife in near mint condition, made in Seki, Japan of AUS-8A steel. Scarce and difficult to find.