KMC
Looking back on my research it seems I got mixed up between the Wright Cyclone engines and Pratt Whitney Twin Wasp engines. I think I got it straightened out and here is the corrected data.
The 23E50/6477A-0 propellers were used on many aircraft during ww2 but the ones that were present in the Aleutian Islands during ww2 are the B-17E, B-24D, and C-47. Engines used by those aircraft were:
B-17E (Wright Cyclone R-1820)
B-24D (P&W R1830-43)
C-47 (P&W R-1830-90C) aircraft.
With your help I am able to eliminate the B-17E from consideration because the mystery prop does not have the R-1820 reduction gear attached. The choice left is between the bomber and cargo plane. Looking at the photos, is it possible to tell if the prop has an 1830-43 or 90C reduction gear attached to it?
Thanks for your valuable help and my apologies for the mix up. I am a novice at all things aviation and have much to learn.
Pete