B64-547. PROTOTYPE HOLLOW AND ROUND SET. Justus Traut Patent. Patented 7/30/78, it consists of matched sets of hollow and round bottoms, each with a dedicated cutter, that are clamped onto a typical Stanley-type cast iron plane frame with two toggles. All the sources agree that it was never manufactured, so this was probably a prototype made by the model shop. The frame has the early serpentine casting on the tote and illegible remnants of a paper label, and it includes three hollow and round pairs plus one unmatched hollow. All contained in a wooden box with no markings. A unique (in the proper sense of the word) piece of Stanley history. Condition: Fine, Estimate: 3000-6000