This is a rarely seen, heavy duty, adjustable type wrench marked "IMPROVED STRONG JAW REC NO.52394" in stamped lettering on the handle area. This is a thumbscrew gear jaw drive design. A interest curved handle design, with 5.8" wide jaws at the widest point, in good condition overall. This is a nice straight wrench with no rust and a little bit of wear. A nice clean example with good markings on it. It is believe to be British made, marked as Schulz's No. 758.