It does have the a similar blade profile to what a Lancaster had using the Hamilton Standard 23EX propeller. The 6519 at 13 foot nominal diameter, blade is also similar in profile to the blade models 6501, 6507, 6541, which were used on the DC-4/C-54, F4U, TBF/TBM, P-47, to name a few. The blade in a shortened 6519-18, 10 foot 6 diameter was used on the Mosquito and DC-3/C-47. So the only way to confirm the blade model is to actually look at the model number metal stamped onto the shank of the blade, which is below the ground.