To make and break cable tool joints with circle jack (or however you handle them).
Overall length around 53",
Spanner size for around 4" to 4-3/4" wrench flats / squares.
Presumably American manufactured with carbon and/or alloy steels, but unsure if this is Acme, Spang, Gill Rock Drill, Ideco, Trident, Rampp, O.W.S. Co., Keystone or maybe another historical tooling manufacturer.