The 6477 paddle blade was the standard blade used on the Wright 1820 series, and the P & W 1830 series engines, B-17, B-24, c-47, and later the PBY, plus other aircraft. That blade model was used in the 23E50 propeller model. The "HSP 5" was the alloy specification used to manufacture the blade. The MFG # shows the manufacturer as "P", and the sequential number of the blade from the manufacture. There is no way to trace a blade to a propeller, then to an aircraft, unless you had access to the original records.