OEM?? ANCO wipers removed from 73 dart sport 340

I recently removed these wipers from a highly optioned 73 dart sport 340 w/ 340 car
I believe them to be oem parts but am not positive, does any one know if these are original or not and maybe the worth and maybe what all cars came with these wipers or if they are specific to this car.... i can only find reproductions that look simular but there have to be pics of the same somewhere, I just can't find em to compare

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