Welcome to the forum
Well for starters it is off a Hamilton Standard counterweight propeller - or a licence built copy which will not show on the list I have.
The blade part (Drawing) number is shown in the second photo as 6153A
That blade was used on multiple aircraft and you would need to measure the full length to determine which aircraft it most likely came from.
Although that blade was used on the A-20, B-24 and C-42, among others, you can eliminate them as they used full feathering hydromatic props, not non feathering counterweight props.
The OA-5 used a 6153A-16 and the A-17 used the 6153A-21. I did not see any others on my list but that does not mean much.
Michael Hope will hopefully be able to provide you with further details like the finishing specs for that blade
and later aircraft that may have used that blade.