The prop blade paddle type used for later airplanes. The B-17F and G and also for the B-24D, E, G, H, J, K. Additionally used with the DC-3/C-47, C-76, C-87, C-105, C-117. The balde for the 11ft 7in propellers.
The "-0" is part of the blade model, which means the reduction in diameter of the entire propeller assembly.
The "CHG D" is the engineering drawing change that that the blade was manufactured to.
The "H.S.P 5" is the alloy that was used to manufacturer the blade from, this is considered the "soft" alloy blade.
The "MFG. No. FF 6252" is the manufacturers serial number for the blade. The "FF" seems to be the actual contract manufacturing facility,
The "Cont..." is the contract that the blade was produced under.