Thanks for that Ian - mystery solved. My uncle worked on Air Sea Rescue Launches in the Pacific in WW2 although I don't know if he would have ended up on the Cocos Islands. I think he was in the Solomons.
It makes you wonder if the source of the blades could have been from the remains of the German cruiser SMS Emden after it ran ashore on the Cocos Islands following its battle with the RAN cruiser Sydney.
According to Wikipedia the Emden was apparently only broken up for scrap by a Japanese company in the 1950's and there are still bits of it lying around on the Island.
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