Thanks for all input. It appears that the blade was installed in a 43D50 propeller. Maybe a -601, -603, or -637 propeller.
T-28 or Grumman Albatross are possibilities, might be something else as well. Going to keep investigating. Any other ideas or info greatly appreciated.
Pictures of the subject prop blade are attached. There were two identical blades available I got one and a friend got the other, his serial number is N536389 (picture attached) my blade is serial number N536115. The picture of the blade is the one I got, and there is a picture of my serial...
I just obtained a Hamilton Standard prop (one blade) with the following info on the blade: Dwg No 6601A-7, Serial No N536389. Curious what model aircraft it might have be on and what time period it might have been in production. Any info appreciated.