The threaded end of the screw is very rough as if its been cut away with a chisel ( maybe to shorten it for use ). The notch in the brass washer closest to the lens appears to have been perhaps filed in ( the edges seem to show a slightly rough bevel ).
I appologize if I was unclear, I did not intend to infere that this piece is Roman, only that screws have been around for quite a along time so would have been avaliable in the 16/17th century if that is in fact how old this piece is.
Is there any evidence of how this would have been closed? If it is indeed some sort of scale standard or if you prefer bishops mantle there should be some method of closing the two sides together.
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