This knot has evolved into several different methods of tying, all under the name of Homer Rhode Loop Knot (occasionally "Homer-Rhodes"). The original version is constructed with two overhand knots. It then was "improved" to consist of the first knot a single over hand and the second a two-loop overhand knot. The greatest divergence from the original is presented by Bill Nash in his book "Flycasting Systems" wherein the knot is constructed with a double overhand knot followed by another double overhand knot but tied in the opposite direction as the first.
Depicted here is the improved version showing the option of a double-loop overhand knot in the second knot position. We find this version adds strength to the original while retaining the simplicity of the knot.