Nice one Dwight!
This one is in the museum, low S and a straight handle, like yours. The low S would indicate 63/64 production. The model 20 first appeared in the 1963 catalog with the standard model described as a straight leather handle. The "Ward Gay" model was pictured then and for several years after in the catalog as an upgrade, and was first called the "Ward Gay special" in the 1965 catalog.