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Without visible part numbers it's hard to tell. If you are an interested buyer, then the seller should be able to give you some kind of assurance on the provenance of the artifact including pictures of part numbers or documentation confirming the wreck location where it was taken from.
The blade appears to possibly be a hollow steel blade, based on the damage to the leading edge. It also appears to be a right hand rotation blade. It is NOT a Hamilton Standard or De Havilland "Aluminum" blade as they did not use a nut the hold the blade to the hub. The shank has some similarities to what Curtis used. If it is Curtis, then it is similar in shape and size to a P-47 blade, but dot not take that to the bank, uneducated thought.
Is the blade material actually steel magnetic, or aluminum non magnetic? If the blade is steel then it could be P-47; but the P-47 blades used a cuff on the inner portion, which is missing from these blades.indeed it looks like a pale P-47 propeller.
Is a p-47 propeller blade 1m95 long and 33cm wide?
What information would you need to be sure to identify it correctly?
A prop coming from Rouen could be from any allied fighter at almost any time in the war.The part has traveled, the seller is in Brittany and the propeller blade would come from Rouen.
Is it already a pale military propeller and not civilian? so it's not for Mosquito, Lancaster and other bombers?