Was the door glass installed after the doors were painted? If so, does that mean that the bolts seen on the outside of the door that hold the glass and regulator mechanisms in place are not painted in body color but are a natural finish?
"Natural Finish" in the terms of non-painted. Its a left over term that MCA has used for decades to desribe just that - unpainted parts but it lacks details as to the correct/original finish of those non-painted items
Here are some examples of the retaining nuts and bolts for the regulator and other items that hold these parts to the door shell, from unrestored cars.
Interior side
D1- D2-D3-D4-At the door end San Jose used both toothed and wavy washers depending on when the car was assembled
D5-D6- If your wondering the latch and retaining screw were covered with spray grease years ago and have collected a layer of gunk and dust
Hope this helps